diff --git a/utility.h65 b/utility.h65
index eca9032..506c9ed 100644
--- a/utility.h65
+++ b/utility.h65
@@ -79,7 +79,9 @@ INCLUDE_UTILITY = 1
 ;; @TODO optimize when immediate is used
 ;;********************************************************************************
 .macro MaskedWrite addr,value,mask
+    .if .not .match(value, A)
     lda value
+    .endif
     eor addr
     and mask
     eor addr