diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArgumentParser.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArgumentParser.java
index 0d4d572e7c05..531ff8b47b95 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArgumentParser.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArgumentParser.java
@@ -217,9 +217,6 @@ public void parse(CEntryPointCreateIsolateParameters parameters, IsolateArgument
         }
 
         copyStringArguments(arguments);
-
-        // Temporarily needed.
-        overrideParameters(parameters, arguments);
     }
 
     @Uninterruptible(reason = "Tear-down in progress.")
@@ -269,12 +266,6 @@ private static void copyStringArguments(IsolateArguments arguments) {
         }
     }
 
-    // Temporary method.
-    @Uninterruptible(reason = CALLED_FROM_UNINTERRUPTIBLE_CODE, mayBeInlined = true)
-    protected void overrideParameters(CEntryPointCreateIsolateParameters parameters, IsolateArguments arguments) {
-        parameters.setReservedSpaceSize(WordFactory.unsigned(readLong(arguments, getOptionIndex(SubstrateGCOptions.ReservedAddressSpaceSize))));
-    }
-
     /**
      * Note that this logic must be in sync with
      * {@link com.oracle.svm.core.option.RuntimeOptionParser#parseAndConsumeAllOptions}.
diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArguments.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArguments.java
index 0e16ef1730a2..90d4b640fafa 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArguments.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/IsolateArguments.java
@@ -30,8 +30,6 @@
 import org.graalvm.nativeimage.c.type.CLongPointer;
 import org.graalvm.word.PointerBase;
 
-import com.oracle.svm.core.c.function.CEntryPointCreateIsolateParameters;
-
 @RawStructure
 public interface IsolateArguments extends PointerBase {
 
@@ -60,7 +58,6 @@ public interface IsolateArguments extends PointerBase {
     @RawField
     void setProtectionKey(int pkey);
 
-    // Temporary unused.
     @RawField
     int getProtectionKey();
 
@@ -70,11 +67,4 @@ public interface IsolateArguments extends PointerBase {
     @RawField
     boolean getIsCompilationIsolate();
 
-    // Temporary field.
-    @RawField
-    void setParameters(CEntryPointCreateIsolateParameters parameters);
-
-    @RawField
-    CEntryPointCreateIsolateParameters getParameters();
-
 }
diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/graal/snippets/CEntryPointSnippets.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/graal/snippets/CEntryPointSnippets.java
index 89db07381e90..1b41bc3d5bb8 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/graal/snippets/CEntryPointSnippets.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/graal/snippets/CEntryPointSnippets.java
@@ -242,9 +242,6 @@ private static int createIsolate(CEntryPointCreateIsolateParameters providedPara
         CLongPointer parsedArgs = StackValue.get(IsolateArgumentParser.singleton().getParsedArgsSize());
         arguments.setParsedArgs(parsedArgs);
 
-        // Temporarily needed.
-        arguments.setParameters(parameters);
-
         IsolateArgumentParser.singleton().parse(parameters, arguments);
 
         Container.initialize();
diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/CommittedMemoryProvider.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/CommittedMemoryProvider.java
index a36381519cc3..a7b01f526f33 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/CommittedMemoryProvider.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/CommittedMemoryProvider.java
@@ -32,7 +32,6 @@
 
 import com.oracle.svm.core.IsolateArguments;
 import com.oracle.svm.core.Uninterruptible;
-import com.oracle.svm.core.c.function.CEntryPointCreateIsolateParameters;
 
 import jdk.graal.compiler.api.replacements.Fold;
 
@@ -53,13 +52,7 @@ static CommittedMemoryProvider get() {
      * @return zero in case of success, non-zero in case of an error.
      */
     @Uninterruptible(reason = "Still being initialized.")
-    int initialize(WordPointer heapBasePointer, CEntryPointCreateIsolateParameters parameters);
-
-    @Uninterruptible(reason = "Still being initialized.")
-    default int initialize(WordPointer heapBasePointer, IsolateArguments arguments) {
-        // The default implementation of this method is temporary.
-        return initialize(heapBasePointer, arguments.getParameters());
-    }
+    int initialize(WordPointer heapBasePointer, IsolateArguments arguments);
 
     /**
      * Tear down <em>for the current isolate</em>. This must be the last method of this interface
diff --git a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/OSCommittedMemoryProvider.java b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/OSCommittedMemoryProvider.java
index f7115ef811ce..60d06ade6fb4 100644
--- a/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/OSCommittedMemoryProvider.java
+++ b/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/os/OSCommittedMemoryProvider.java
@@ -32,10 +32,10 @@
 import org.graalvm.nativeimage.Platforms;
 import org.graalvm.nativeimage.c.type.WordPointer;
 
+import com.oracle.svm.core.IsolateArguments;
 import com.oracle.svm.core.Isolates;
 import com.oracle.svm.core.SubstrateOptions;
 import com.oracle.svm.core.Uninterruptible;
-import com.oracle.svm.core.c.function.CEntryPointCreateIsolateParameters;
 import com.oracle.svm.core.c.function.CEntryPointErrors;
 import com.oracle.svm.core.feature.AutomaticallyRegisteredFeature;
 import com.oracle.svm.core.feature.InternalFeature;
@@ -48,7 +48,7 @@ public OSCommittedMemoryProvider() {
 
     @Override
     @Uninterruptible(reason = "Still being initialized.")
-    public int initialize(WordPointer heapBasePointer, CEntryPointCreateIsolateParameters parameters) {
+    public int initialize(WordPointer heapBasePointer, IsolateArguments arguments) {
         if (!SubstrateOptions.SpawnIsolates.getValue()) {
             int result = protectSingleIsolateImageHeap();
             if (result == CEntryPointErrors.NO_ERROR) {