diff --git a/core/os/input_event.cpp b/core/os/input_event.cpp
index 9878dd41c4e..36dbca3a3fd 100644
--- a/core/os/input_event.cpp
+++ b/core/os/input_event.cpp
@@ -416,7 +416,7 @@ void InputEventMouseButton::set_factor(float p_factor) {
 	factor = p_factor;
 }
 
-float InputEventMouseButton::get_factor() {
+float InputEventMouseButton::get_factor() const {
 
 	return factor;
 }
diff --git a/core/os/input_event.h b/core/os/input_event.h
index c6b04bcfa5c..0d228d9fe5d 100644
--- a/core/os/input_event.h
+++ b/core/os/input_event.h
@@ -328,7 +328,7 @@ protected:
 
 public:
 	void set_factor(float p_factor);
-	float get_factor();
+	float get_factor() const;
 
 	void set_button_index(int p_index);
 	int get_button_index() const;