diff --git a/DevProxy/ApiControllers/ProxyController.cs b/DevProxy/ApiControllers/ProxyController.cs
index f85f5bf7..6416e649 100644
--- a/DevProxy/ApiControllers/ProxyController.cs
+++ b/DevProxy/ApiControllers/ProxyController.cs
@@ -124,7 +124,7 @@ public IActionResult GetRootCertificate([FromQuery][Required] string format)
         var pem = "-----BEGIN CERTIFICATE-----\n" + base64Cert + "\n-----END CERTIFICATE-----";
         var pemBytes = System.Text.Encoding.ASCII.GetBytes(pem);
 
-        return File(pemBytes, "application/x-x509-ca-cert", "devProxy.pem");
+        return File(pemBytes, "application/x-x509-ca-cert", "devProxy.crt");
     }
 
     [HttpGet("logs")]