diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/banglejs/BangleJSDeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/banglejs/BangleJSDeviceSupport.java
index 4cb8f3a86..7d4e9194d 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/banglejs/BangleJSDeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/banglejs/BangleJSDeviceSupport.java
@@ -435,7 +435,7 @@ public class BangleJSDeviceSupport extends AbstractBTLEDeviceSupport {
                 } catch (JSONException e) {
                     LOG.warn("jsonToString object error: " + e.getLocalizedMessage());
                 }
-                json += key+":"+jsonToStringInternal(o);
+                json += "\""+key+"\":"+jsonToStringInternal(o);
                 if (iter.hasNext()) json+=",";
             }
             return json+"}";