diff --git a/libnymea/interfaces/mediacontroller.json b/libnymea/interfaces/mediacontroller.json
index bf6de865..45a2e404 100644
--- a/libnymea/interfaces/mediacontroller.json
+++ b/libnymea/interfaces/mediacontroller.json
@@ -5,6 +5,7 @@
         {
             "name": "skipBack"
         },
+        {
             "name": "stop"
         },
         {
diff --git a/libnymea/interfaces/mediametadataprovider.json b/libnymea/interfaces/mediametadataprovider.json
index f6d9f122..6c67dc90 100644
--- a/libnymea/interfaces/mediametadataprovider.json
+++ b/libnymea/interfaces/mediametadataprovider.json
@@ -4,19 +4,19 @@
     "states": [
         {
             "name": "title",
-            "type": "string"
+            "type": "QString"
         },
         {
             "name": "artist",
-            "type": "string"
+            "type": "QString"
         },
         {
             "name": "collection",
-            "type": "string"
+            "type": "QString"
         },
         {
             "name": "artwork",
-            "type": "string"
+            "type": "QString"
         }
     ]
 }
diff --git a/libnymea/interfaces/mediaplayer.json b/libnymea/interfaces/mediaplayer.json
index a8afe7a1..3db46bf4 100644
--- a/libnymea/interfaces/mediaplayer.json
+++ b/libnymea/interfaces/mediaplayer.json
@@ -4,12 +4,12 @@
     "states": [
         {
             "name": "playbackStatus",
-            "type": "string",
+            "type": "QString",
             "allowedValues": ["Playing", "Paused", "Stopped"]
         },
         {
             "name": "playerType",
-            "type": "string",
+            "type": "QString",
             "allowedValues": ["audio", "video"]
         }
     ]
diff --git a/libnymea/interfaces/shufflerepeat.json b/libnymea/interfaces/shufflerepeat.json
index 770c4d9e..c96fdc63 100644
--- a/libnymea/interfaces/shufflerepeat.json
+++ b/libnymea/interfaces/shufflerepeat.json
@@ -8,7 +8,7 @@
         },
         {
             "name": "repeat",
-            "type": "string",
+            "type": "QString",
             "allowedValues": ["None", "One", "All"],
             "writable": true
         }