diff --git a/neutron/agent/linux/external_process.py b/neutron/agent/linux/external_process.py
index e8437336ae8..5a82f3fdc2d 100644
--- a/neutron/agent/linux/external_process.py
+++ b/neutron/agent/linux/external_process.py
@@ -128,8 +128,9 @@ class ProcessManager(MonitoredProcess):
     def get_kill_cmd(self, sig, pid):
         if self.kill_scripts_path:
             kill_file = "%s-kill" % self.service
-            if os.path.isfile(os.path.join(self.kill_scripts_path, kill_file)):
-                return [kill_file, sig, pid]
+            kill_file_path = os.path.join(self.kill_scripts_path, kill_file)
+            if os.path.isfile(kill_file_path):
+                return [kill_file_path, sig, pid]
         return ['kill', '-%s' % (sig), pid]
 
     def get_pid_file_name(self):
diff --git a/neutron/tests/unit/agent/linux/test_external_process.py b/neutron/tests/unit/agent/linux/test_external_process.py
index d2aa240098a..3821a30b7b7 100644
--- a/neutron/tests/unit/agent/linux/test_external_process.py
+++ b/neutron/tests/unit/agent/linux/test_external_process.py
@@ -271,7 +271,8 @@ class TestProcessManager(base.BaseTestCase):
                                          kill_scripts_path='test-path/'):
         cfg.CONF.set_override("kill_scripts_path", kill_scripts_path, "AGENT")
         if kill_script_exists:
-            expected_cmd = ['test-service-kill', '9', 4]
+            expected_cmd = [
+                os.path.join(kill_scripts_path, 'test-service-kill'), '9', 4]
         else:
             expected_cmd = ['kill', '-9', 4]