diff --git a/libbreezecommon/breezeboxshadowrenderer.cpp b/libbreezecommon/breezeboxshadowrenderer.cpp
--- a/libbreezecommon/breezeboxshadowrenderer.cpp
+++ b/libbreezecommon/breezeboxshadowrenderer.cpp
@@ -45,13 +45,7 @@
 
 static inline qreal calculateBlurStdDev(int radius)
 {
-    // https://www.w3.org/TR/css-backgrounds-3/#shadow-blur says that the resulting
-    // shadow must approximate the image that would be generated by applying to the
-    // shadow a Gaussian blur with a standard deviation equal to half the blur radius,
-    // but we had been using a slightly different (non-standard compliant) routine to
-    // derive the standard deviation before, so in order to not break existing shadow
-    // params, we're not following the standard.
-    return radius * 0.43; // TODO: Multiply by 0.5 instead.
+    return radius * 0.5;
 }
 
 static inline QSize calculateBlurExtent(int radius)