diff --git a/libnymea/interfaces/extendedheating.json b/libnymea/interfaces/extendedheating.json
index eaa5ee3d..fe340991 100644
--- a/libnymea/interfaces/extendedheating.json
+++ b/libnymea/interfaces/extendedheating.json
@@ -7,6 +7,7 @@
             "type": "int",
             "min": 0,
             "max": 100,
+            "unit": "Percentage",
             "writable": true
         }
     ]