diff --git a/src/main/java/org/mockito/internal/util/reflection/GenericMetadataSupport.java b/src/main/java/org/mockito/internal/util/reflection/GenericMetadataSupport.java
index ef64c5bb6..c7edd9cea 100644
--- a/src/main/java/org/mockito/internal/util/reflection/GenericMetadataSupport.java
+++ b/src/main/java/org/mockito/internal/util/reflection/GenericMetadataSupport.java
@@ -91,7 +91,7 @@ public abstract class GenericMetadataSupport {
 
             Class<?> rawType = extractRawTypeOf(typeToRegister);
             typesToRegister.add(rawType.getGenericSuperclass());
-            typesToRegister.addAll(Arrays.asList(rawType.getGenericInterfaces()));
+            Collections.addAll(typesToRegister, rawType.getGenericInterfaces());
         }
     }