diff --git a/libraries/AP_WheelEncoder/WheelEncoder_SITL_Quadrature.cpp b/libraries/AP_WheelEncoder/WheelEncoder_SITL_Quadrature.cpp
index 5caa9f0d19..9fc073d545 100644
--- a/libraries/AP_WheelEncoder/WheelEncoder_SITL_Quadrature.cpp
+++ b/libraries/AP_WheelEncoder/WheelEncoder_SITL_Quadrature.cpp
@@ -55,7 +55,7 @@ void AP_WheelEncoder_SITL_Quadrature::update(void)
     // distance from center of wheel axis to each wheel
     const double half_wheelbase = ( fabsf(_frontend.get_pos_offset(0).y) + fabsf(_frontend.get_pos_offset(1).y) )/2.0f;
     if (is_zero(half_wheelbase)) {
-        gcs().send_text(MAV_SEVERITY_WARNING, "WheelEncoder: wheel offset not set!");
+        GCS_SEND_TEXT(MAV_SEVERITY_WARNING, "WheelEncoder: wheel offset not set!");
     }
 
     if (_state.instance == 0) { 
@@ -69,7 +69,7 @@ void AP_WheelEncoder_SITL_Quadrature::update(void)
 
     const double radius = _frontend.get_wheel_radius(_state.instance);
     if (is_zero(radius)) { // avoid divide by zero
-        gcs().send_text(MAV_SEVERITY_WARNING, "WheelEncoder: wheel radius not set!");
+        GCS_SEND_TEXT(MAV_SEVERITY_WARNING, "WheelEncoder: wheel radius not set!");
         return; 
     }
 
@@ -86,4 +86,4 @@ void AP_WheelEncoder_SITL_Quadrature::update(void)
     copy_state_to_frontend(_distance_count, _total_count, 0, time_now);
 }
 
-#endif
\ No newline at end of file
+#endif