diff --git a/libraries/AP_Arming/AP_Arming.h b/libraries/AP_Arming/AP_Arming.h
index 74c3fad77c..5fa1a46e08 100644
--- a/libraries/AP_Arming/AP_Arming.h
+++ b/libraries/AP_Arming/AP_Arming.h
@@ -92,7 +92,7 @@ protected:
 
     virtual bool compass_checks(bool report);
 
-    bool gps_checks(bool report);
+    virtual bool gps_checks(bool report);
 
     bool battery_checks(bool report);