diff --git a/libs/pcg/include/psemek/pcg/perlin.hpp b/libs/pcg/include/psemek/pcg/perlin.hpp
index e8fde98d..babc663d 100644
--- a/libs/pcg/include/psemek/pcg/perlin.hpp
+++ b/libs/pcg/include/psemek/pcg/perlin.hpp
@@ -122,7 +122,9 @@ namespace psemek::pcg
 				values[mask] = smoothstep(values[mask], values[mask | (1 << i)], t[i]);
 		}
 
-		return 0.5 * (1. + std::sqrt(2.) * values[0]);
+		auto const M = std::sqrt(T(N) / T(4));
+
+		return 0.5 * (1. + values[0] / M);
 	}
 
 }