--- xnu/xnu-792.12.6/libkern/c++/OSString.cpp
+++ xnu/xnu-792.13.8/libkern/c++/OSString.cpp
@@ -166,7 +166,7 @@
 void OSString::free()
 {
     if ( !(flags & kOSStringNoCopy) && string) {
-        kfree((vm_offset_t)string, (vm_size_t)length);
+        kfree(string, (vm_size_t)length);
         ACCUMSIZE(-length);
     }