diff --git a/HTML.CEF/CefSystem.cs b/HTML.CEF/CefSystem.cs
index bcca438b..6b66f2cb 100644
--- a/HTML.CEF/CefSystem.cs
+++ b/HTML.CEF/CefSystem.cs
@@ -56,6 +56,8 @@ public bool Init(ReadOnlySpan<char> pBaseDir, IHtmlResourceHandler resourceHandl
 			BrowserSubprocessPath = Path.Combine(chromiumDir, OperatingSystem.IsWindows() ? "HTML.CEF.Process.exe" : "HTML.CEF.Process"),
 		};
 
+		Environment.SetEnvironmentVariable("DOTNET_DiagnosticPorts", null);
+
 		try {
 			CefRuntime.Initialize(new CefMainArgs([]), settings, new CefApplication(), 0);
 		}