diff --git a/src/graphics/render/Decorator.cpp b/src/graphics/render/Decorator.cpp
index 85e86ba40..f8a6c8372 100644
--- a/src/graphics/render/Decorator.cpp
+++ b/src/graphics/render/Decorator.cpp
@@ -115,7 +115,10 @@ void Decorator::updateAcoustics(const Camera& camera) {
         hit++;
         averageDistance += distance * 0.2f;
     }
-    float decayTime = (averageDistance / hit) * glm::max(0.0f, glm::pow(hit / static_cast<float>(rays), 9.0f) - 0.6f) * 1.6f;
+    float decayTime =
+        glm::sqrt(averageDistance / hit) *
+        glm::max(0.0f, glm::pow(hit / static_cast<float>(rays), 3.0f) - 0.6f) *
+        1.6f;
     decayTime *= 2.5f;
     decayTime *= decayTime;
     logger.info() << "rays hit " << hit << "/" << rays << " decay-time: " << decayTime;