diff --git a/web.config b/web.config
index 549588c32160..a18f48a2e641 100644
--- a/web.config
+++ b/web.config
@@ -9,7 +9,7 @@
             <remove fileExtension=".gltf" />
             <mimeMap fileExtension=".gltf" mimeType="application/json" />
             <remove fileExtension=".bgltf" />
-            <mimeMap fileExtension=".bgltf" mimeType="application/vnd.gltf.binary" />
+            <mimeMap fileExtension=".bgltf" mimeType="model/vnd.gltf.binary" />
             <remove fileExtension=".json" />
             <mimeMap fileExtension=".json" mimeType="application/json" />
             <remove fileExtension=".geojson" />