diff --git a/src/twn_input.c b/src/twn_input.c
index cc00eca..8f258d9 100644
--- a/src/twn_input.c
+++ b/src/twn_input.c
@@ -233,7 +233,8 @@ void input_state_update(InputState *input) {
     SDL_GetRelativeMouseState(&x, &y);
     input->mouse_relative_position = (Vec2){ (float)x, (float)y };
 
-    ctx.game.mouse_position = input->mouse_window_position;
+    ctx.game.mouse_position.x = ((float)input->mouse_window_position.x - ctx.viewport_rect.x) / ctx.viewport_scale;
+    ctx.game.mouse_position.y = ((float)input->mouse_window_position.y - ctx.viewport_rect.y) / ctx.viewport_scale;
 
     if (ctx.window_mouse_resident)
         ctx.game.mouse_movement = input->mouse_relative_position;