Index: src/OFObject.m
==================================================================
--- src/OFObject.m
+++ src/OFObject.m
@@ -456,11 +456,11 @@
 	   implementation: (IMP)implementation
 {
 #if defined(OF_APPLE_RUNTIME) || defined(OF_GNU_RUNTIME)
 	return class_addMethod(self, selector, implementation, typeEncoding);
 #elif defined(OF_OLD_GNU_RUNTIME)
-	@throw [OFNotImplementedException newWithClass: isa
+	@throw [OFNotImplementedException newWithClass: self
 					      selector: _cmd];
 #endif
 }
 
 + (void)inheritInstanceMethodsFromClass: (Class)class