diff --git a/compiler/ogwasm.pas b/compiler/ogwasm.pas
index 068c8b3e4d..5f2c1bb36d 100644
--- a/compiler/ogwasm.pas
+++ b/compiler/ogwasm.pas
@@ -217,6 +217,7 @@ implementation
         b: byte;
         shift:integer;
       begin
+        b:=0;
         result:=0;
         shift:=0;
         repeat