diff --git a/ICSharpCode.Decompiler/IL/Transforms/AssignVariableNames.cs b/ICSharpCode.Decompiler/IL/Transforms/AssignVariableNames.cs
index 062eb6435..1c3c6df0e 100644
--- a/ICSharpCode.Decompiler/IL/Transforms/AssignVariableNames.cs
+++ b/ICSharpCode.Decompiler/IL/Transforms/AssignVariableNames.cs
@@ -165,7 +165,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 
 			static bool IsLowerCase(string name)
 			{
-				return name.Length > 0 && char.ToLowerInvariant(name[0]) == name[0];
+				return name.Length > 0 && char.ToLower(name[0]) == name[0];
 			}
 		}