diff --git a/libraries/AP_IMU/AP_IMU_Shim.h b/libraries/AP_IMU/AP_IMU_Shim.h
index 89ab56d13f..e32442c78d 100644
--- a/libraries/AP_IMU/AP_IMU_Shim.h
+++ b/libraries/AP_IMU/AP_IMU_Shim.h
@@ -14,8 +14,8 @@ public:
 	/// @name IMU protocol
 	//@{
 	virtual void	init(Start_style style) {}
-	virtual void	init_accel(Start_style style) {};
-	virtual void	init_gyro(Start_style style) {};
+	virtual void	init_accel() {};
+	virtual void	init_gyro() {};
 	virtual bool	update(void) {
 		bool updated = _updated;
 		_updated = false;