diff --git a/kitty/trail_fragment.glsl b/kitty/trail_fragment.glsl
index 31d9523e699..099fc35e3f9 100644
--- a/kitty/trail_fragment.glsl
+++ b/kitty/trail_fragment.glsl
@@ -10,7 +10,7 @@ void main() {
     float opacity = trail_opacity;
     // Dont render if fragment is within cursor area
     float in_x = step(cursor_edge_x[0], frag_pos.x) * step(frag_pos.x, cursor_edge_x[1]);
-    float in_y = step(cursor_edge_y[0], frag_pos.y) * step(frag_pos.y, cursor_edge_y[1]);
+    float in_y = step(cursor_edge_y[1], frag_pos.y) * step(frag_pos.y, cursor_edge_y[0]);
     opacity *= 1.0f - in_x * in_y;
     final_color = vec4(trail_color, opacity);
 }