diff --git a/recover_bad_signature.sh b/recover_bad_signature.sh
index 377812b..f868e02 100755
--- a/recover_bad_signature.sh
+++ b/recover_bad_signature.sh
@@ -1000,7 +1000,7 @@ if mkdir "$LOCK_DIR" 2> /dev/null ; then
 
    # - Remove lockdir when the script finishes, or when it receives a signal
    # -
-   trap clean_up SIGHUP SIGINT SIGTERM
+   trap 'clean_up 1' SIGHUP SIGINT SIGTERM
 
 else