@@ -114,18 +114,14 @@
 	}
 	[ret replaceOccurrencesOfString: @"\n"
 			     withString: @"\n\t"];
 	[ret appendString: @"\n)}"];
 
+	[ret makeImmutable];
+
 	[pool release];
 
-        /*
-	 * Class swizzle the string to be immutable. We declared the return type
-	 * to be OFString*, so it can't be modified anyway. But not swizzling it
-	 * would create a real copy each time -[copy] is called.
-	 */
-	ret->isa = [OFString class];
 	return ret;
 }
 
 - copy
 {
@@ -246,6 +242,10 @@
 			[self addObject: object];
 	}
 
 	[pool release];
 }
+
+- (void)makeImmutable
+{
+}
 @end