diff --git a/Apps/CesiumViewer/CesiumViewer.js b/Apps/CesiumViewer/CesiumViewer.js
index ea6b571be395..3a07da944985 100644
--- a/Apps/CesiumViewer/CesiumViewer.js
+++ b/Apps/CesiumViewer/CesiumViewer.js
@@ -125,7 +125,7 @@ async function main() {
         sourceType = "geojson";
       } else if (/\.kml$/i.test(source) || /\.kmz$/i.test(source)) {
         sourceType = "kml";
-      } else if (/\.gpx$/i.test(source) || /\.gpx$/i.test(source)) {
+      } else if (/\.gpx$/i.test(source)) {
         sourceType = "gpx";
       }
     }
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 98dcfc400a21..5ffba76b8eba 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -404,3 +404,4 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
 - [Vladislav Yunev](https://github.com/YunVlad)
 - [Levi Montgomery](https://github.com/Levi-Montgomery)
 - [Brandon Berisford](https://github.com/BeyondBelief96)
+- [Adam Wirth](https://https://github.com/adamwirth)