diff --git a/server.js b/server.js
index e496eeebe38..ff99c406902 100644
--- a/server.js
+++ b/server.js
@@ -42,6 +42,7 @@
     var mime = express.static.mime;
     mime.define({
         'application/json' : ['czml', 'json', 'geojson', 'topojson'],
+        'application/wasm' : ['wasm'],
         'image/crn' : ['crn'],
         'image/ktx' : ['ktx'],
         'model/gltf+json' : ['gltf'],
diff --git a/web.config b/web.config
index 46951578bb0..9330dbc8efc 100644
--- a/web.config
+++ b/web.config
@@ -26,6 +26,8 @@
             <mimeMap fileExtension=".geojson" mimeType="application/json" />
             <remove fileExtension=".topojson" />
             <mimeMap fileExtension=".topojson" mimeType="application/json" />
+            <remove fileExtension=".wasm" />
+            <mimeMap fileExtension=".wasm" mimeType="application/wasm" />
             <remove fileExtension=".woff" />
             <mimeMap fileExtension=".woff" mimeType="application/font-woff" />
             <remove fileExtension=".woff2" />