diff --git a/openvpn.py b/openvpn.py
index 757c9a9..81b2e7a 100644
--- a/openvpn.py
+++ b/openvpn.py
@@ -6,6 +6,7 @@ import tempfile
 import os
 import time
 import openvpn_api
+import signal
 
 
 def generate_config(in_fp, cfg):
@@ -94,7 +95,7 @@ class Openvpn:
     async def stop(self):
         if self.status == RUNNING:
             try:
-                os.kill(self.PID)
+                os.kill(self.PID, signal.SIGKILL)
             except Exception as err:
                 print("kill failed:", err)