diff --git a/src/wedo2smarthub.ts b/src/wedo2smarthub.ts
index 143c6cf..d1d6965 100644
--- a/src/wedo2smarthub.ts
+++ b/src/wedo2smarthub.ts
@@ -315,7 +315,7 @@ export class WeDo2SmartHub extends Hub {
         const keys = Object.keys(Consts.BLECharacteristic);
         for (let i = 0; i < keys.length; i++) {
             const key = keys[i];
-            if (Consts.BLECharacteristic[key as any] === uuid) {
+            if (Consts.BLECharacteristic[key as keyof typeof Consts.BLECharacteristic] === uuid) {
                 return key;
             }
         }