diff --git a/paw/stos/head/arch/amd64/prim.h b/paw/stos/head/arch/amd64/prim.h
index 05b8c35..62bd8c7 100644
--- a/paw/stos/head/arch/amd64/prim.h
+++ b/paw/stos/head/arch/amd64/prim.h
@@ -20,8 +20,8 @@
  * @Ptr: Location to swap with @Value
  * @Value: Value to swap to @Ptr
  */
-ALWAYS_INLINE static inline QUAD
-MdCpuAswap(QUAD *Ptr, QUAD Value)
+ALWAYS_INLINE static inline UQUAD
+MdCpuAswap(UQUAD *Ptr, UQUAD Value)
 {
     QUAD RetVal;
 
@@ -29,7 +29,7 @@ MdCpuAswap(QUAD *Ptr, QUAD Value)
         return 0;
     }
 
-    RetVal = *(volatile QUAD *)Ptr;
+    RetVal = *(volatile UQUAD *)Ptr;
     ASMV(
         "xchg %0, %1\n"
         : "+m" (*Ptr), "+r" (Value)