diff --git a/wadsrc/static/shaders/glsl/main.fp b/wadsrc/static/shaders/glsl/main.fp
index 07688d9df..1c146510b 100644
--- a/wadsrc/static/shaders/glsl/main.fp
+++ b/wadsrc/static/shaders/glsl/main.fp
@@ -158,7 +158,7 @@ float shadowmapAttenuation(vec4 lightpos, float shadowIndex)
 		else
 			u = dir.x / dir.y * 0.125 + (0.50 + 0.125);
 	}
-	dir -= sign(dir) * 5.0; // margin, to remove wall acne
+	dir -= sign(dir) * 2.0; // margin, to remove wall acne
 	float dist2 = dot(dir, dir);
 	return texture(ShadowMap, vec2(u, v)).x > dist2 ? 1.0 : 0.0;
 }