diff --git a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/JClass.kt b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/JClass.kt
index 85f95f4..1b01888 100644
--- a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/JClass.kt
+++ b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/JClass.kt
@@ -18,6 +18,7 @@ val Float = JClass("F")
 val Double = JClass("D")
 val Void = JClass("V")
 val String = createSignature("java.lang.String")
+val Object = createSignature("java.lang.Object")
 
 val BooleanArray = JClass("[Z")
 val ByteArray = JClass("[B")
diff --git a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Signature.kt b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Signature.kt
index 5ccfe18..ebfcf2b 100644
--- a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Signature.kt
+++ b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Signature.kt
@@ -1,5 +1,6 @@
 package io.github.landrynorris.jniutils
 
+import kotlinx.cinterop.CPointed
 import platform.android.jobject
 import platform.android.jstring
 import kotlin.reflect.KClass
@@ -12,7 +13,11 @@ data class Signature(val parameterClasses: List<JClass>, val returnClass: JClass
     }
 }
 
-inline fun <reified T> signature() = classToSignature(typeOf<T>())
+inline fun <reified T> signature() = if(T::class == CPointed::class) {
+    error("We can't get the type from a CPointed yet.")
+} else {
+    classToSignature(typeOf<T>())
+}
 
 inline fun classToSignature(type: KType) = when(type) {
     typeOf<Unit>() -> Void
@@ -25,13 +30,14 @@ inline fun classToSignature(type: KType) = when(type) {
     typeOf<Float>() -> Float
     typeOf<Double>() -> Double
     typeOf<BooleanArray>() -> BooleanArray
+    typeOf<LongArray>() -> LongArray
     typeOf<ByteArray>() -> ByteArray
     typeOf<ShortArray>() -> ShortArray
     typeOf<CharArray>() -> CharArray
     typeOf<IntArray>() -> IntArray
     typeOf<FloatArray>() -> FloatArray
     typeOf<DoubleArray>() -> DoubleArray
-    typeOf<jobject>() -> createSignature("java.lang.Object")
+    typeOf<jobject>() -> Object
     typeOf<jstring>() -> String
     else -> createSignature(type.toString())
 }
diff --git a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/SignatureFromFunction.kt b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/SignatureFromFunction.kt
index 9c626f3..435e15c 100644
--- a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/SignatureFromFunction.kt
+++ b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/SignatureFromFunction.kt
@@ -1,28 +1,35 @@
 package io.github.landrynorris.jniutils
 
 import kotlinx.cinterop.CPointer
-import kotlinx.cinterop.staticCFunction
 import platform.android.JNIEnvVar
 import platform.android.jobject
 import kotlin.reflect.typeOf
 
 inline fun <reified R> signature(function: (CPointer<JNIEnvVar>, jobject) -> R): String {
+    if(R::class.isCPointer()) error("CPointer classes are not currently supported")
     return Signature(listOf(), classToSignature(typeOf<R>())).toString()
 }
 
 inline fun <reified R, reified T> signature(function: (CPointer<JNIEnvVar>, jobject, T) -> R): String {
+    if(T::class.isCPointer() || R::class.isCPointer())
+        error("CPointer classes are not currently supported")
     return Signature(listOf(classToSignature(typeOf<T>())),
         classToSignature(typeOf<R>())).toString()
 }
 
 inline fun <reified R, reified T, reified S>
         signature(function: (CPointer<JNIEnvVar>, jobject, T, S) -> R): String {
+    if(T::class.isCPointer() || R::class.isCPointer() || S::class.isCPointer())
+        error("CPointer classes are not currently supported")
     return Signature(listOf(typeOf<T>(), typeOf<S>()).map { classToSignature(it) },
         classToSignature(typeOf<R>())).toString()
 }
 
 inline fun <reified R, reified T, reified S, reified U>
         signature(function: (CPointer<JNIEnvVar>, jobject, T, S, U) -> R): String {
+    if(T::class.isCPointer() || R::class.isCPointer() || S::class.isCPointer()
+        || U::class.isCPointer())
+        error("CPointer classes are not currently supported")
     return Signature(listOf(typeOf<T>(), typeOf<S>(), typeOf<U>()).map { classToSignature(it) },
         classToSignature(typeOf<R>())
     ).toString()
@@ -30,6 +37,9 @@ inline fun <reified R, reified T, reified S, reified U>
 
 inline fun <reified R, reified T, reified S, reified U, reified V>
         signature(function: (CPointer<JNIEnvVar>, jobject, T, S, U, V) -> R): String {
+    if(T::class.isCPointer() || R::class.isCPointer() || S::class.isCPointer()
+        || U::class.isCPointer() || V::class.isCPointer())
+        error("CPointer classes are not currently supported")
     return Signature(listOf(typeOf<T>(), typeOf<S>(), typeOf<U>(), typeOf<V>()).map { classToSignature(it) },
         classToSignature(typeOf<R>())
     ).toString()
@@ -37,6 +47,9 @@ inline fun <reified R, reified T, reified S, reified U, reified V>
 
 inline fun <reified R, reified T, reified S, reified U, reified V, reified W>
         signature(function: (CPointer<JNIEnvVar>, jobject, T, S, U, V, W) -> R): String {
+    if(T::class.isCPointer() || R::class.isCPointer() || S::class.isCPointer()
+        || U::class.isCPointer() || V::class.isCPointer() || W::class.isCPointer())
+        error("CPointer classes are not currently supported")
     return Signature(listOf(typeOf<T>(), typeOf<S>(), typeOf<U>(), typeOf<V>(), typeOf<W>()).map { classToSignature(it) },
         classToSignature(typeOf<R>())
     ).toString()
@@ -44,6 +57,10 @@ inline fun <reified R, reified T, reified S, reified U, reified V, reified W>
 
 inline fun <reified R, reified T, reified S, reified U, reified V, reified W, reified X>
         signature(function: (CPointer<JNIEnvVar>, jobject, T, S, U, V, W, X) -> R): String {
+    if(T::class.isCPointer() || R::class.isCPointer() || S::class.isCPointer()
+        || U::class.isCPointer() || V::class.isCPointer() || W::class.isCPointer()
+        || X::class.isCPointer())
+        error("CPointer classes are not currently supported")
     return Signature(listOf(typeOf<T>(), typeOf<S>(), typeOf<U>(), typeOf<V>(), typeOf<W>(), typeOf<X>()).map { classToSignature(it) },
         classToSignature(typeOf<R>())
     ).toString()
@@ -51,6 +68,10 @@ inline fun <reified R, reified T, reified S, reified U, reified V, reified W, re
 
 inline fun <reified R, reified T, reified S, reified U, reified V, reified W, reified X, reified Y>
         signature(function: (CPointer<JNIEnvVar>, jobject, T, S, U, V, W, X, Y) -> R): String {
+    if(T::class.isCPointer() || R::class.isCPointer() || S::class.isCPointer()
+        || U::class.isCPointer() || V::class.isCPointer() || W::class.isCPointer()
+        || X::class.isCPointer() || Y::class.isCPointer())
+        error("CPointer classes are not currently supported")
     return Signature(listOf(typeOf<T>(), typeOf<S>(), typeOf<U>(), typeOf<V>(), typeOf<W>(), typeOf<X>(), typeOf<Y>())
         .map { classToSignature(it) },
         classToSignature(typeOf<R>())
diff --git a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Utils.kt b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Utils.kt
index d91c708..05b484d 100644
--- a/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Utils.kt
+++ b/jni-utils/src/commonMain/kotlin/io/github/landrynorris/jniutils/Utils.kt
@@ -2,6 +2,11 @@ package io.github.landrynorris.jniutils
 
 import kotlinx.cinterop.*
 import platform.android.*
+import kotlin.reflect.KClass
+
+inline fun <T: KClass<*>> T.isCPointer(): Boolean {
+    return this == CPointer::class
+}
 
 fun jboolean.toBoolean(): Boolean = (this == JNI_TRUE.toUByte())
 
diff --git a/sample/src/androidMain/jniLibs/arm64-v8a/libsample.so b/sample/src/androidMain/jniLibs/arm64-v8a/libsample.so
index 48b3943..d638183 100755
Binary files a/sample/src/androidMain/jniLibs/arm64-v8a/libsample.so and b/sample/src/androidMain/jniLibs/arm64-v8a/libsample.so differ
diff --git a/sample/src/androidMain/jniLibs/armeabi-v7a/libsample.so b/sample/src/androidMain/jniLibs/armeabi-v7a/libsample.so
index 8db47f6..7f78a90 100755
Binary files a/sample/src/androidMain/jniLibs/armeabi-v7a/libsample.so and b/sample/src/androidMain/jniLibs/armeabi-v7a/libsample.so differ
diff --git a/sample/src/androidMain/jniLibs/x86/libsample.so b/sample/src/androidMain/jniLibs/x86/libsample.so
index 4edc59b..297cd5c 100755
Binary files a/sample/src/androidMain/jniLibs/x86/libsample.so and b/sample/src/androidMain/jniLibs/x86/libsample.so differ
diff --git a/sample/src/androidMain/jniLibs/x86_64/libsample.so b/sample/src/androidMain/jniLibs/x86_64/libsample.so
index b90afee..5c1c1b2 100755
Binary files a/sample/src/androidMain/jniLibs/x86_64/libsample.so and b/sample/src/androidMain/jniLibs/x86_64/libsample.so differ
diff --git a/sample/src/androidMain/kotlin/io/github/landrynorris/sample/JniBridge.kt b/sample/src/androidMain/kotlin/io/github/landrynorris/sample/JniBridge.kt
index 51c4278..540d045 100644
--- a/sample/src/androidMain/kotlin/io/github/landrynorris/sample/JniBridge.kt
+++ b/sample/src/androidMain/kotlin/io/github/landrynorris/sample/JniBridge.kt
@@ -14,6 +14,7 @@ object JniBridge {
     external fun doubleAll(array: DoubleArray): DoubleArray
     external fun callJavaFunction(value: Double)
     external fun createDataClass(s: String?, i: Int, d: Double, doubles: DoubleArray): Any
+    external fun signatureWithCType(s: String): Boolean
     external fun buttonClicked(ptr: Long)
     external fun getText(ptr: Long): String
     external fun createRepository(): Long
diff --git a/sample/src/androidMain/kotlin/io/github/landrynorris/sample/MainActivity.kt b/sample/src/androidMain/kotlin/io/github/landrynorris/sample/MainActivity.kt
index 2094934..470f390 100644
--- a/sample/src/androidMain/kotlin/io/github/landrynorris/sample/MainActivity.kt
+++ b/sample/src/androidMain/kotlin/io/github/landrynorris/sample/MainActivity.kt
@@ -41,6 +41,9 @@ class MainActivity: AppCompatActivity() {
         JniBridge.methodWithParameters(50)
         JniBridge.callJavaFunction(12.5)
 
+        val didThrowException = JniBridge.signatureWithCType("Something")
+        if(!didThrowException) error("No error when trying to get type of CPointer")
+
         val s = "A string"
         val i = 200
         val d = 256.5
diff --git a/sample/src/ndkMain/kotlin/io/github/landrynorris/jni/sample/Jni.kt b/sample/src/ndkMain/kotlin/io/github/landrynorris/jni/sample/Jni.kt
index 9d2043a..c0bfec3 100644
--- a/sample/src/ndkMain/kotlin/io/github/landrynorris/jni/sample/Jni.kt
+++ b/sample/src/ndkMain/kotlin/io/github/landrynorris/jni/sample/Jni.kt
@@ -68,6 +68,15 @@ fun handleSharedClass(env: CPointer<JNIEnvVar>, thiz: jobject, data: jobject): j
     return s.toJString(env) ?: error("Unable to create JString")
 }
 
+fun signatureWithCType(env: CPointer<JNIEnvVar>, thiz: jobject, s: jstring): jboolean {
+    return try {
+        println("Signature is ${signature(::signatureWithCType)}")
+        false.toJBoolean()
+    } catch (e: IllegalStateException) {
+        true.toJBoolean()
+    }
+}
+
 fun crash(env: CPointer<JNIEnvVar>, thiz: jobject, message: jstring) {
     val messageString = env.getString(message)
     env.fatalError(messageString)
@@ -111,8 +120,7 @@ fun registerJniNatives(env: CPointer<JNIEnvVar>) {
         }
 
         method("createDataClass") {
-            signature = Signature(listOf(String, Int, Double, DoubleArray),
-                createSignature("java.lang.Object")).toString()
+            signature = Signature(listOf(String, Int, Double, DoubleArray), Object).toString()
             function = staticCFunction(::createDataClass)
         }
 
@@ -130,6 +138,11 @@ fun registerJniNatives(env: CPointer<JNIEnvVar>) {
             signature = Signature(listOf(signature<SharedClass>()), String).toString()
             function = staticCFunction(::handleSharedClass)
         }
+
+        method("signatureWithCType") {
+            signature = Signature(listOf(String), Boolean).toString()
+            function = staticCFunction(::signatureWithCType)
+        }
     }
     println("Finished registering native methods")
 }