diff --git a/ssl-bump/run.sh b/ssl-bump/run.sh
index 025c182..5a2bc37 100644
--- a/ssl-bump/run.sh
+++ b/ssl-bump/run.sh
@@ -7,6 +7,11 @@ if [ ! -d /var/cache/squid/ssl_db ]; then
 	/usr/lib/squid/security_file_certgen -c -s /var/cache/squid/ssl_db -M 4MB
 fi
 
+# force remove pid
+if [ -e /var/run/squid/squid.pid ]; then
+	rm -f /var/run/squid/squid.pid
+fi
+
 # init cache
 /usr/sbin/squid -f "${SQUID_CONFIG_FILE}" --foreground -z