diff --git a/Scripts/developer_scripts/autotest_cgal b/Scripts/developer_scripts/autotest_cgal
index 97488b57560..1f61951e1e3 100755
--- a/Scripts/developer_scripts/autotest_cgal
+++ b/Scripts/developer_scripts/autotest_cgal
@@ -902,7 +902,7 @@ chmod u+w "$LOCK_FILE"
 echo $$ > "$LOCK_FILE"
 
 # that line makes the script remove the lock file in case of unwanted exit
-trap "rm -f $LOCK_FILE" EXIT HUP INT TERM
+trap "rm -f \"$LOCK_FILE\"" EXIT HUP INT TERM
 
 # Notify test started
 if [ ! "${MAIL_ADDRESS}" = "must_be_set_in_.autocgalrc" ]; then