diff --git a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c b/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
index 5f453d18e4..31672ae5cf 100644
--- a/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
+++ b/ArmPkg/Library/StandaloneMmMmuLib/AArch64/ArmMmuStandaloneMmLib.c
@@ -101,7 +101,7 @@ SendMemoryPermissionRequest (
   }
 
   // Check error response from Callee.
-  if (*RetVal & BIT31) {
+  if ((*RetVal & BIT31) != 0) {
     // Bit 31 set means there is an error retured
     // See [1], Section 13.5.5.1 MM_SP_MEMORY_ATTRIBUTES_GET_AARCH64 and
     // Section 13.5.5.2 MM_SP_MEMORY_ATTRIBUTES_SET_AARCH64.