diff --git a/config.dev.yaml b/config.dev.yaml
index 2344f6e31..b9709caae 100644
--- a/config.dev.yaml
+++ b/config.dev.yaml
@@ -65,4 +65,4 @@ services:
       png: true #new feature
       speech: true #new feature
       texvcinfo: true
-      speechOn: true
+      speech_on: true
diff --git a/config.prod.yaml b/config.prod.yaml
index 8144b321b..7d7d35c83 100644
--- a/config.prod.yaml
+++ b/config.prod.yaml
@@ -37,4 +37,4 @@ services:
       img: true
       texvcinfo: true
       speech: true
-      sppechOn: false
+      speech_on: false
diff --git a/routes/mathoid.js b/routes/mathoid.js
index 9ce6359f3..6ded984c3 100644
--- a/routes/mathoid.js
+++ b/routes/mathoid.js
@@ -136,7 +136,7 @@ function handleRequest(res, q, type, outFormat, features) {
  */
 router.post('/:outformat?/', function (req, res) {
     var outFormat;
-    var speech = app.conf.speechOn;
+    var speech = app.conf.speech_on;
     // First some rudimentary input validation
     if (!(req.body.q)) {
         emitError("q (query) post parameter is missing!");