diff --git a/src/MIDebugEngine/Natvis.Impl/Natvis.cs b/src/MIDebugEngine/Natvis.Impl/Natvis.cs
index edf7f702a..fdd8a8001 100755
--- a/src/MIDebugEngine/Natvis.Impl/Natvis.cs
+++ b/src/MIDebugEngine/Natvis.Impl/Natvis.cs
@@ -1264,6 +1264,7 @@ private string FormatValue(string format, IVariableInformation variable, IDictio
             {
                 return String.Empty;
             }
+            format = format.Trim();
             StringBuilder value = new StringBuilder();
             for (int i = 0; i < format.Length; ++i)
             {