diff --git a/hsmw-highlight b/hsmw-highlight
index 440bdb3..721b59a 100644
--- a/hsmw-highlight
+++ b/hsmw-highlight
@@ -701,4 +701,4 @@ __HSMW_HIGHLIGHT_TOKENS_TYPES=(
   __hsmw_highlight_main__command_type_cache=()
 }
 
-__HSMW_MH_SOURCED=1
+typeset -g __HSMW_MH_SOURCED=1