diff --git a/selfdrive/controls/lib/longitudinal_mpc_lib/long_mpc.py b/selfdrive/controls/lib/longitudinal_mpc_lib/long_mpc.py
index 6b79813117..79a9ec4f0c 100644
--- a/selfdrive/controls/lib/longitudinal_mpc_lib/long_mpc.py
+++ b/selfdrive/controls/lib/longitudinal_mpc_lib/long_mpc.py
@@ -352,7 +352,7 @@ class LongitudinalMpc:
       x_and_cruise = np.column_stack([x, cruise_target])
       x = np.min(x_and_cruise, axis=1)
 
-      self.source = 'e2e' if x_and_cruise[0,0] < x_and_cruise[0,1] else 'cruise'
+      self.source = 'e2e' if x_and_cruise[1,0] < x_and_cruise[1,1] else 'cruise'
 
     else:
       raise NotImplementedError(f'Planner mode {self.mode} not recognized in planner update')