diff --git a/src/API.ts b/src/API.ts
index ad75338..071f711 100644
--- a/src/API.ts
+++ b/src/API.ts
@@ -290,7 +290,8 @@ export class UserAPI {
         if (bpm === undefined)
             return this.app.clock.bpm
 
-        this.app.clock.bpm = bpm
+        if (bpm < 1 || bpm > 500)
+            this.app.clock.bpm = bpm
         return bpm
     }
     tempo = this.bpm