diff --git a/selfdrive/car/mazda/interface.py b/selfdrive/car/mazda/interface.py
index 89ed5638cb..7c42431e33 100755
--- a/selfdrive/car/mazda/interface.py
+++ b/selfdrive/car/mazda/interface.py
@@ -10,10 +10,6 @@ EventName = car.CarEvent.EventName
 
 class CarInterface(CarInterfaceBase):
 
-  @staticmethod
-  def compute_gb(accel, speed):
-    return float(accel) / 4.0
-
   @staticmethod
   def get_params(candidate, fingerprint=gen_empty_fingerprint(), car_fw=None, experimental_long=False):
     ret = CarInterfaceBase.get_std_params(candidate, fingerprint)
diff --git a/selfdrive/car/mock/interface.py b/selfdrive/car/mock/interface.py
index 2c7f4611ee..77e3703c2d 100755
--- a/selfdrive/car/mock/interface.py
+++ b/selfdrive/car/mock/interface.py
@@ -28,10 +28,6 @@ class CarInterface(CarInterfaceBase):
     self.yaw_rate = 0.
     self.yaw_rate_meas = 0.
 
-  @staticmethod
-  def compute_gb(accel, speed):
-    return accel
-
   @staticmethod
   def get_params(candidate, fingerprint=gen_empty_fingerprint(), car_fw=None, experimental_long=False):
     ret = CarInterfaceBase.get_std_params(candidate, fingerprint)