diff --git a/libnymea/interfaces/evcharger.json b/libnymea/interfaces/evcharger.json
index 2822ad7e..680f166b 100644
--- a/libnymea/interfaces/evcharger.json
+++ b/libnymea/interfaces/evcharger.json
@@ -28,6 +28,15 @@
             "maxValue": 3,
             "optional": true
         },
+        {
+            "name": "desiredPhaseCount",
+            "type": "uint",
+            "minValue": 1,
+            "maxValue": 3,
+            "possibleValues": "any",
+            "writable": true,
+            "optional": true
+        },
         {
             "name": "sessionEnergy",
             "type": "double",