diff --git a/robomaster_pi/conn_vel.py b/robomaster_pi/conn_vel.py
index 838f062276fa2e5a008229b614ad572d0cb68feb..7b54ee606fbf0c6cd56e7da32c97c916d02b1a4a 100644
--- a/robomaster_pi/conn_vel.py
+++ b/robomaster_pi/conn_vel.py
@@ -32,7 +32,7 @@ class vel_from_ros_node(Node):
     def check_connection():
         print("ja")
         self.response = self.isConnected()
-        if(self.response =! True):
+        if(self.response != True):
             self.my_ep_chassis.drive_speed(x = 0, y = 0, z = 0.5)