diff --git a/lang/m2/comp/char.tab b/lang/m2/comp/char.tab
index e4f57402f..eedff7333 100644
--- a/lang/m2/comp/char.tab
+++ b/lang/m2/comp/char.tab
@@ -40,7 +40,7 @@ STEOI:\200
 %	ISHEX
 %
 %C
-1:a-fA-F
+1:A-F0-9
 %Tchar ishex[] = {
 %p
 %T};