diff --git a/libraries/RC/APM2_RC.cpp b/libraries/RC/APM2_RC.cpp
index ca56b8b5e0..247b10c1d7 100644
--- a/libraries/RC/APM2_RC.cpp
+++ b/libraries/RC/APM2_RC.cpp
@@ -198,7 +198,7 @@ APM2_RC::trim()
 		radio_trim[y] = radio_in[y];
 }
 void
-AP_RC::twitch_servos(void)
+APM2_RC::twitch_servos(uint8_t times)
 {
 	// todo
 }
@@ -324,4 +324,4 @@ void APM2_RC::force_out_6_7(void)
 	if (TCNT3 > 5000)
 		TCNT3 = 39990;
 }
-#endif
\ No newline at end of file
+#endif
diff --git a/libraries/RC/APM2_RC.h b/libraries/RC/APM2_RC.h
index c2dd459a97..b4c536379c 100644
--- a/libraries/RC/APM2_RC.h
+++ b/libraries/RC/APM2_RC.h
@@ -14,6 +14,7 @@ class APM2_RC : public RC
 	void output();
 	void set_ch_pwm(uint8_t ch, uint16_t pwm);
 	void trim();
+	void twitch_servos(uint8_t times);
 
 	void force_out_0_1(void);
 	void force_out_2_3(void);
diff --git a/libraries/RC/AP_RC.h b/libraries/RC/AP_RC.h
index ff878fa907..8118f980fd 100644
--- a/libraries/RC/AP_RC.h
+++ b/libraries/RC/AP_RC.h
@@ -14,6 +14,7 @@ class AP_RC : public RC
 	void output();
 	void set_ch_pwm(uint8_t ch, uint16_t pwm);
 	void trim();
+	void twitch_servos(uint8_t times);
 	
 	int16_t radio_in[4];
 	int16_t radio_min[4];