diff --git a/pushbullet/pushbullet.py b/pushbullet/pushbullet.py
index 6645679..8bd5032 100644
--- a/pushbullet/pushbullet.py
+++ b/pushbullet/pushbullet.py
@@ -170,7 +170,7 @@ def dismiss_push(self, iden):
         data = {"dismissed": True}
         r = self._session.post("{}/{}".format(self.PUSH_URL, iden), data=json.dumps(data))
 
-        if r.status_code =! requests.codes.ok:
+        if r.status_code != requests.codes.ok:
             raise PushBulletError(r.text)
 
     def delete_push(self, iden):