diff --git a/lib/Server.js b/lib/Server.js
index df60ccff74..0030fa560d 100644
--- a/lib/Server.js
+++ b/lib/Server.js
@@ -132,6 +132,10 @@ function Server (compiler, options = {}, _log) {
   // eslint-disable-next-line
   const app = this.app = new express();
 
+  // ref: https://github.com/webpack/webpack-dev-server/issues/1575
+  // remove this when send@^0.16.3
+  express.static.mime.types.wasm = 'application/wasm';
+
   app.all('*', (req, res, next) => {
     if (this.checkHost(req.headers)) {
       return next();
diff --git a/test/ContentBase.test.js b/test/ContentBase.test.js
index c2d105f50e..bcd98a7acd 100644
--- a/test/ContentBase.test.js
+++ b/test/ContentBase.test.js
@@ -121,4 +121,18 @@ describe('ContentBase', () => {
         .expect(404, done);
     });
   });
+
+  describe('Content type', () => {
+    before((done) => {
+      server = helper.start(config, {
+        contentBase: [contentBasePublic]
+      }, done);
+      req = request(server.app);
+    });
+
+    it('Request foo.wasm', (done) => {
+      req.get('/foo.wasm')
+        .expect('Content-Type', 'application/wasm', done);
+    });
+  });
 });
diff --git a/test/fixtures/contentbase-config/public/foo.wasm b/test/fixtures/contentbase-config/public/foo.wasm
new file mode 100644
index 0000000000..e69de29bb2