diff --git a/src/Core/Diagnostics.cs b/src/Core/Diagnostics.cs
index 10fdc531..01da11f8 100644
--- a/src/Core/Diagnostics.cs
+++ b/src/Core/Diagnostics.cs
@@ -31,7 +31,7 @@ namespace CppSharp
     public interface IDiagnostics
     {
         void Emit(DiagnosticInfo info);
-        void PushIndent(int level);
+        void PushIndent(int level = 4);
         void PopIndent();
     }