diff --git a/src/main/java/com/teketik/test/mockinbean/BeanUtils.java b/src/main/java/com/teketik/test/mockinbean/BeanUtils.java
index 388c368..7dd707f 100644
--- a/src/main/java/com/teketik/test/mockinbean/BeanUtils.java
+++ b/src/main/java/com/teketik/test/mockinbean/BeanUtils.java
@@ -75,7 +75,7 @@ static Field findField(Class<?> clazz, @Nullable String name, Class<?> type) {
             } else {
                 results[1] = Boolean.FALSE; //multiple matching fields
             }
-        }, field -> field.getType().equals(type));
+        }, field -> field.getType().isAssignableFrom(type));
         if (results[0] != null) {
             Assert.isTrue(
                 !(results[0] instanceof Boolean),
diff --git a/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementation1Test.java b/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementation1Test.java
new file mode 100644
index 0000000..9ad5606
--- /dev/null
+++ b/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementation1Test.java
@@ -0,0 +1,35 @@
+package com.teketik.test.mockinbean.test;
+
+
+import com.teketik.test.mockinbean.MockInBean;
+import com.teketik.test.mockinbean.test.InterfaceImplementationTestConfig.LoggingService;
+import com.teketik.test.mockinbean.test.InterfaceImplementationTestConfig.ProviderServiceImpl;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Import;
+
+@Import(InterfaceImplementationTestConfig.class)
+public class InterfaceImplementation1Test extends BaseTest {
+
+    @Autowired
+    protected LoggingService loggingService;
+
+    @MockInBean(LoggingService.class)
+    private ProviderServiceImpl providerService;
+
+    @MockInBean(LoggingService.class)
+    private ProviderServiceImpl providerServiceImpl;
+
+    @Test
+    public void test() {
+        Mockito.when(providerService.provideValue()).thenReturn("mocked value");
+        Mockito.when(providerServiceImpl.provideValue()).thenReturn("mocked value 2");
+
+        Assertions.assertEquals("mocked value", loggingService.logCurrentValue());
+        Assertions.assertEquals("mocked value 2", loggingService.logCurrentValueWithImpl());
+    }
+
+}
diff --git a/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementation2Test.java b/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementation2Test.java
new file mode 100644
index 0000000..c07704c
--- /dev/null
+++ b/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementation2Test.java
@@ -0,0 +1,36 @@
+package com.teketik.test.mockinbean.test;
+
+
+import com.teketik.test.mockinbean.MockInBean;
+import com.teketik.test.mockinbean.test.InterfaceImplementationTestConfig.LoggingService;
+import com.teketik.test.mockinbean.test.InterfaceImplementationTestConfig.ProviderService;
+import com.teketik.test.mockinbean.test.InterfaceImplementationTestConfig.ProviderServiceImpl;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Import;
+
+@Import(InterfaceImplementationTestConfig.class)
+public class InterfaceImplementation2Test extends BaseTest {
+
+    @Autowired
+    protected LoggingService loggingService;
+
+    @MockInBean(LoggingService.class)
+    private ProviderService providerServiceMock;
+
+    @MockInBean(LoggingService.class)
+    private ProviderServiceImpl providerServiceImpl;
+
+    @Test
+    public void test() {
+        Mockito.when(providerServiceMock.provideValue()).thenReturn("mocked value");
+        Mockito.when(providerServiceImpl.provideValue()).thenReturn("mocked value 2");
+
+        Assertions.assertEquals("mocked value", loggingService.logCurrentValue());
+        Assertions.assertEquals("mocked value 2", loggingService.logCurrentValueWithImpl());
+    }
+
+}
diff --git a/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementationTestConfig.java b/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementationTestConfig.java
new file mode 100644
index 0000000..514ce44
--- /dev/null
+++ b/src/test/java/com/teketik/test/mockinbean/test/InterfaceImplementationTestConfig.java
@@ -0,0 +1,39 @@
+package com.teketik.test.mockinbean.test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Service;
+
+class InterfaceImplementationTestConfig {
+
+    public interface ProviderService {
+        public String provideValue();
+    }
+
+    @Service
+    public static class ProviderServiceImpl implements ProviderService {
+        @Override
+        public String provideValue() {
+            return "value1";
+        }
+    }
+
+    @Component
+    public static class LoggingService {
+
+        @Autowired
+        private ProviderService providerService;
+
+        @Autowired
+        private ProviderServiceImpl providerServiceImpl;
+
+        public String logCurrentValue() {
+            return providerService.provideValue();
+        }
+
+        public String logCurrentValueWithImpl() {
+            return providerServiceImpl.provideValue();
+        }
+    }
+
+}