diff --git a/kiwmi/desktop/output.c b/kiwmi/desktop/output.c
index c4bfb9d..9192024 100644
--- a/kiwmi/desktop/output.c
+++ b/kiwmi/desktop/output.c
@@ -130,8 +130,8 @@ output_frame_notify(struct wl_listener *listener, void *data)
     wlr_renderer_begin(renderer, width, height);
     wlr_renderer_clear(renderer, (float[]){0.1f, 0.1f, 0.1f, 1.0f});
 
-    double output_lx;
-    double output_ly;
+    double output_lx = 0;
+    double output_ly = 0;
     wlr_output_layout_output_coords(
         output_layout, wlr_output, &output_lx, &output_ly);