diff --git a/libs/pcg/source/perlin.cpp b/libs/pcg/source/perlin.cpp
index 20264b16..9d3c87be 100644
--- a/libs/pcg/source/perlin.cpp
+++ b/libs/pcg/source/perlin.cpp
@@ -44,7 +44,8 @@ namespace psemek::pcg
 		float const d01 = tx * grad_map_(ix, iy+1)[0] + (ty-1.f) * grad_map_(ix, iy+1)[1];
 		float const d11 = (tx-1.f) * grad_map_(ix+1, iy+1)[0] + (ty-1.f) * grad_map_(ix+1, iy+1)[1];
 
-		return smoothstep(smoothstep(d00, d10, tx), smoothstep(d01, d11, tx), ty);
+		float v = smoothstep(smoothstep(d00, d10, tx), smoothstep(d01, d11, tx), ty) * std::sqrt(2.f);
+		return 0.5f + v * 0.5f;
 	}
 
 }