diff --git a/service/ptos/head/arch/amd64/prim.h b/service/ptos/head/arch/amd64/prim.h
index 73743ff..e91d910 100644
--- a/service/ptos/head/arch/amd64/prim.h
+++ b/service/ptos/head/arch/amd64/prim.h
@@ -21,7 +21,7 @@
  * @Value: Value to swap to @Ptr
  */
 ALWAYS_INLINE static inline UQUAD
-MdCpuAswap(UUQUAD *Ptr, UQUAD Value)
+MdCpuAswap(UQUAD *Ptr, UQUAD Value)
 {
     UQUAD RetVal;