diff --git a/Source/HtmlRenderer/Core/Dom/CssBoxProperties.cs b/Source/HtmlRenderer/Core/Dom/CssBoxProperties.cs
index e74671701..b4641e2a3 100644
--- a/Source/HtmlRenderer/Core/Dom/CssBoxProperties.cs
+++ b/Source/HtmlRenderer/Core/Dom/CssBoxProperties.cs
@@ -1432,7 +1432,7 @@ public double ActualBorderSpacingVertical
         /// <returns></returns>
         public double GetEmHeight()
         {
-            return ActualFont.Height;
+            return ActualFont.Size * 96d / 72d;
         }
 
         /// <summary>