diff --git a/uisimulator/buttonmap/hiby-r3proii.c b/uisimulator/buttonmap/hiby-r3proii.c
index 8ef94c9c7a..7b5e0b87a2 100644
--- a/uisimulator/buttonmap/hiby-r3proii.c
+++ b/uisimulator/buttonmap/hiby-r3proii.c
@@ -26,6 +26,7 @@
 
 int key_to_button(int keyboard_button)
 {
+    (void)keyboard_button;
     return BUTTON_NONE;
 }