diff --git a/ruamoko/include/Object.h b/ruamoko/include/Object.h
index a88f9163f..593d6b86e 100644
--- a/ruamoko/include/Object.h
+++ b/ruamoko/include/Object.h
@@ -60,7 +60,7 @@
 #endif	// invocations
 + (BOOL) instancesRespondToSelector: (SEL)aSelector;
 + (BOOL) respondsToSelector: (SEL)aSelector;
-+ (BOOL) conformsToProtocol: (Protocol)aProtocol;
++ (BOOL) conformsToProtocol: (Protocol *)aProtocol;
 + (BOOL) isKindOfClass: (Class)aClass;
 + (void) poseAsClass: (Class)aClass;
 + (Class) superclass;
diff --git a/ruamoko/lib/Object.r b/ruamoko/lib/Object.r
index 9857a3bb9..ff5fa2a30 100644
--- a/ruamoko/lib/Object.r
+++ b/ruamoko/lib/Object.r
@@ -114,7 +114,7 @@ BOOL (id object) object_is_meta_class = #0;
 	return NO;
 }
 
-+ (BOOL) conformsToProtocol: (Protocol)aProtocol = #0;
++ (BOOL) conformsToProtocol: (Protocol *)aProtocol = #0;
 
 + (BOOL) instancesRespondToSelector: (SEL)aSelector
 {