diff --git a/src/util/hass-call-api.js b/src/util/hass-call-api.js
index 25c3f48803..230cd9ce1a 100644
--- a/src/util/hass-call-api.js
+++ b/src/util/hass-call-api.js
@@ -47,7 +47,7 @@ export default function hassCallApi(host, auth, method, path, parameters) {
     };
 
     if (parameters) {
-      req.setRequestHeader('Content-Type', 'application;charset=UTF-8');
+      req.setRequestHeader('Content-Type', 'application/json;charset=UTF-8');
       req.send(JSON.stringify(parameters));
     } else {
       req.send();