diff --git a/src/W800 SDK v1.00.08/app/gfx/compass_screen.c b/src/W800 SDK v1.00.08/app/gfx/compass_screen.c
index 6abebae..3c7420f 100644
--- a/src/W800 SDK v1.00.08/app/gfx/compass_screen.c	
+++ b/src/W800 SDK v1.00.08/app/gfx/compass_screen.c	
@@ -142,7 +142,7 @@ bool compass_screen_is_in_use(CompassScreen_t *const compassScreen)
     if(!compassScreen)
     {
         LV_LOG_ERROR("NULL pointer given !");
-        return;
+        return false;
     }
 
     return compassScreen->display != NULL;