Index: src/OFObject.m
==================================================================
--- src/OFObject.m
+++ src/OFObject.m
@@ -21,11 +21,13 @@
 #import "OFAutoreleasePool.h"
 #import "OFExceptions.h"
 #import "OFMacros.h"
 
 #import <objc/objc-api.h>
-#ifndef __objc_INCLUDE_GNU
+#ifdef __objc_INCLUDE_GNU
+#import <objc/sarray.h>
+#else
 #import <objc/runtime.h>
 #endif
 
 struct pre_ivar {
 	void   **memchunks;
@@ -137,10 +139,17 @@
 	if (oldimp == (IMP)0 || newimp == (IMP)0)
 		@throw [OFInvalidArgumentException newWithClass: self
 						    andSelector: _cmd];
 
 	method->method_imp = newimp;
+
+	/* Update the dtable if necessary */
+	if (sarray_get_safe(((Class)self)->dtable,
+	    (sidx)method->method_name->sel_id))
+		sarray_at_put_safe(((Class)self)->dtable,
+		    (sidx)method->method_name->sel_id, method->method_imp);
+
 	return oldimp;
 #else
 	Method method = class_getInstanceMethod(self, selector);
 	IMP imp = class_getMethodImplementation(class, selector);