diff --git a/libnymea/interfaces/batterylevel.json b/libnymea/interfaces/batterylevel.json
index 5a90b91a..e9533acb 100644
--- a/libnymea/interfaces/batterylevel.json
+++ b/libnymea/interfaces/batterylevel.json
@@ -5,7 +5,8 @@
             "name": "batteryLevel",
             "type": "int",
             "minValue": 0,
-            "maxValue": 100
+            "maxValue": 100,
+            "unit": "Percentage"
         }
     ]
 }