diff --git a/source/blender/draw/modes/shaders/object_outline_detect_frag.glsl b/source/blender/draw/modes/shaders/object_outline_detect_frag.glsl
index 0d6173cf4f2..5be9a39bd75 100644
--- a/source/blender/draw/modes/shaders/object_outline_detect_frag.glsl
+++ b/source/blender/draw/modes/shaders/object_outline_detect_frag.glsl
@@ -45,7 +45,7 @@ void main()
 	if (float(uv.x) < viewportSize.x - 1.0)
 		search_outline(uv, ivec2( 1,  0), ref_col, ref_occlu, outline);
 
-	if (float(uv.y) < viewportSize.x - 1.0)
+	if (float(uv.y) < viewportSize.y - 1.0)
 		search_outline(uv, ivec2( 0,  1), ref_col, ref_occlu, outline);
 
 	if (float(uv.x) > 0)