diff --git a/service/ptos/head/hal/prim.h b/service/ptos/head/hal/prim.h
index c217571..2dbcd30 100644
--- a/service/ptos/head/hal/prim.h
+++ b/service/ptos/head/hal/prim.h
@@ -38,10 +38,10 @@ HalCpuSpinWait(VOID)
  * @Ptr:   Location to swap with @Value
  * @Value: Value to swap with data at @Ptr
  */
-ALWAYS_INLINE static inline VOID
+ALWAYS_INLINE static inline UQUAD
 HalCpuAswap(UQUAD *Ptr, UQUAD Value)
 {
-    MdCpuAswap(Ptr, Value);
+    return MdCpuAswap(Ptr, Value);
 }
 
 #endif  /* !_HAL_PRIM_H_ */