diff --git a/libraries/AP_TECS/AP_TECS.cpp b/libraries/AP_TECS/AP_TECS.cpp
index c87aeb385a..d5c281ad40 100644
--- a/libraries/AP_TECS/AP_TECS.cpp
+++ b/libraries/AP_TECS/AP_TECS.cpp
@@ -252,7 +252,7 @@ const AP_Param::GroupInfo AP_TECS::var_info[] = {
  *
  */
 
-void AP_TECS::update_50hz(float hgt_afe)
+void AP_TECS::update_50hz(void)
 {
     // Implement third order complementary filter for height and height rate
     // estimted height rate = _climb_rate
diff --git a/libraries/AP_TECS/AP_TECS.h b/libraries/AP_TECS/AP_TECS.h
index 70bfe81319..242d9caeb1 100644
--- a/libraries/AP_TECS/AP_TECS.h
+++ b/libraries/AP_TECS/AP_TECS.h
@@ -39,7 +39,7 @@ public:
     // Update of the estimated height and height rate internal state
     // Update of the inertial speed rate internal state
     // Should be called at 50Hz or greater
-    void update_50hz(float hgt_afe);
+    void update_50hz(void);
 
     // Update the control loop calculations
     void update_pitch_throttle(int32_t hgt_dem_cm,