diff --git a/Source/Glass.Mapper.Sc/Utilities.cs b/Source/Glass.Mapper.Sc/Utilities.cs
index f615200fd..15fae7ba8 100644
--- a/Source/Glass.Mapper.Sc/Utilities.cs
+++ b/Source/Glass.Mapper.Sc/Utilities.cs
@@ -74,7 +74,7 @@ public static string ConvertAttributes(SafeDictionary<string> attributes, string
             StringBuilder sb = new StringBuilder();
             foreach (var pair in attributes)
             {
-                sb.AppendFormat("{0}={2}{1}{2} ".Formatted(pair.Key, pair.Value ??"", quotationMark));
+                sb.Append("{0}={2}{1}{2} ".Formatted(pair.Key, pair.Value ??"", quotationMark));
             }
 
             return sb.ToString();