diff --git a/MdePkg/Library/BasePrintLib/PrintLibInternal.c b/MdePkg/Library/BasePrintLib/PrintLibInternal.c
index aed884b176..3374d97e3a 100644
--- a/MdePkg/Library/BasePrintLib/PrintLibInternal.c
+++ b/MdePkg/Library/BasePrintLib/PrintLibInternal.c
@@ -356,7 +356,7 @@ BasePrintLibSPrintMarker (
     ASSERT (Buffer != NULL);
   }
 
-  if (Flags & OUTPUT_UNICODE) {
+  if ((Flags & OUTPUT_UNICODE) != 0) {
     BytesPerOutputCharacter = 2;
   } else {
     BytesPerOutputCharacter = 1;