diff --git a/core/os/input.cpp b/core/os/input.cpp
index e732eac323e..d7c0d86d645 100644
--- a/core/os/input.cpp
+++ b/core/os/input.cpp
@@ -283,7 +283,7 @@ Point2 InputDefault::get_mouse_speed() const {
 
 int InputDefault::get_mouse_button_mask() const {
 
-	OS::get_singleton()->get_mouse_button_state();
+	return OS::get_singleton()->get_mouse_button_state();
 }