diff --git a/src/input_common/mouse/mouse_input.cpp b/src/input_common/mouse/mouse_input.cpp
index 3f4264caaf..d0ee64ad75 100644
--- a/src/input_common/mouse/mouse_input.cpp
+++ b/src/input_common/mouse/mouse_input.cpp
@@ -54,12 +54,13 @@ void Mouse::PressButton(int x, int y, int button_) {
     }
 
     int button = 1 << button_;
+    const auto button_index = static_cast<std::size_t>(button_);
     buttons |= static_cast<u16>(button);
     last_button = static_cast<MouseButton>(button_);
 
-    mouse_info[button_].mouse_origin = Common::MakeVec(x, y);
-    mouse_info[button_].last_mouse_position = Common::MakeVec(x, y);
-    mouse_info[button_].data.pressed = true;
+    mouse_info[button_index].mouse_origin = Common::MakeVec(x, y);
+    mouse_info[button_index].last_mouse_position = Common::MakeVec(x, y);
+    mouse_info[button_index].data.pressed = true;
 }
 
 void Mouse::MouseMove(int x, int y) {
@@ -86,11 +87,12 @@ void Mouse::ReleaseButton(int button_) {
     }
 
     int button = 1 << button_;
+    const auto button_index = static_cast<std::size_t>(button_);
     buttons &= static_cast<u16>(0xFF - button);
 
-    mouse_info[button_].tilt_speed = 0;
-    mouse_info[button_].data.pressed = false;
-    mouse_info[button_].data.axis = {0, 0};
+    mouse_info[button_index].tilt_speed = 0;
+    mouse_info[button_index].data.pressed = false;
+    mouse_info[button_index].data.axis = {0, 0};
 }
 
 void Mouse::BeginConfiguration() {