diff --git a/src/Generator/Generators/CSharp/CSharpTextTemplate.cs b/src/Generator/Generators/CSharp/CSharpTextTemplate.cs
index 868e53e6..5e9649f3 100644
--- a/src/Generator/Generators/CSharp/CSharpTextTemplate.cs
+++ b/src/Generator/Generators/CSharp/CSharpTextTemplate.cs
@@ -2302,7 +2302,7 @@ namespace CppSharp.Generators.CSharp
             var index = overloads.IndexOf(function);
 
             if (index >= 0)
-                identifier += index.ToString(CultureInfo.InvariantCulture);
+                identifier += "_" + index.ToString(CultureInfo.InvariantCulture);
 
             return identifier;
         }