diff --git a/shaders/module/vertex_warp.vert b/shaders/module/vertex_warp.vert
index f1ff1fe..c3abbaf 100644
--- a/shaders/module/vertex_warp.vert
+++ b/shaders/module/vertex_warp.vert
@@ -1,7 +1,7 @@
 
 #define vWarp 0 //	psx vertex warp [0 1 2 4 8 16 32]
 
-vec4 vertex_warp() {
+void vertex_warp() {
 	float mod = pixelSize * vWarp;
 	vec2 screen = vec2(viewWidth / mod, viewHeight / mod);
 	vec4 position = gbufferModelViewInverse * gl_ModelViewMatrix * gl_Vertex;