diff --git a/snippy b/snippy
index c1e8e3e..ef55ccd 100755
--- a/snippy
+++ b/snippy
@@ -59,8 +59,8 @@ readonly placeholder_cursor="{cursor}"
 readonly placeholder_clipboard="{clipboard}"
 readonly placeholder_clipboard_urlencode="{clipboard_urlencode}"
 
-# shellcheck disable=2155
-readonly tmpfile=$(mktemp)
+tmpfile=$(mktemp)
+readonly tmpfile
 trap 'rm -f $tmpfile' EXIT HUP INT TRAP TERM
 
 # colors