Index: src/OFDictionary_hashtable.m
==================================================================
--- src/OFDictionary_hashtable.m
+++ src/OFDictionary_hashtable.m
@@ -122,10 +122,15 @@
 	return self;
 }
 
 - initWithDictionary: (OFDictionary*)dictionary
 {
+	if ([dictionary class] == [OFDictionary_hashtable class] ||
+	    [dictionary class] == [OFMutableDictionary_hashtable class])
+		return [self _initWithDictionary: dictionary
+					copyKeys: YES];
+
 	self = [super init];
 
 	@try {
 		OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
 		OFEnumerator *enumerator;