@@ -200,10 +200,16 @@
 	[ret addObject: [OFString stringWithCString: path_c + last
 					     length: i - last]];
 
 	[pool release];
 
+	/*
+	 * Class swizzle the array to be immutable. We declared the return type
+	 * to be OFArray*, so it can't be modified anyway. But not swizzling it
+	 * would create a real copy each time -[copy] is called.
+	 */
+	ret->isa = [OFArray class];
 	return ret;
 }
 
 + (OFString*)lastComponentOfPath: (OFString*)path
 {
@@ -386,10 +392,16 @@
 	} @finally {
 		FindClose(handle);
 	}
 #endif
 
+	/*
+	 * Class swizzle the array to be immutable. We declared the return type
+	 * to be OFArray*, so it can't be modified anyway. But not swizzling it
+	 * would create a real copy each time -[copy] is called.
+	 */
+	files->isa = [OFArray class];
 	return files;
 }
 
 + (void)changeToDirectory: (OFString*)path
 {