@@ -134,15 +134,15 @@
 #if __OBJFW_RUNTIME_ABI__ || (defined(OF_APPLE_RUNTIME) && defined(__OBJC2__))
 # define OF_HAVE_NONFRAGILE_IVARS
 #endif
 
 #ifdef OF_HAVE_NONFRAGILE_IVARS
-# define OF_RESERVE_IVARS(num)
+# define OF_RESERVE_IVARS(cls, num)
 #else
-# define OF_RESERVE_IVARS(num)						   \
+# define OF_RESERVE_IVARS(cls, num)					   \
 	@private							   \
-		void *OF_PREPROCESSOR_CONCAT(_reserved, __COUNTER__)[num];
+		void *OF_PREPROCESSOR_CONCAT(_reserved_, cls)[num];
 #endif
 
 #ifdef __GNUC__
 # define OF_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
 #else