diff --git a/app/src/main/java/org/schabi/newpipe/util/potoken/PoTokenWebView.kt b/app/src/main/java/org/schabi/newpipe/util/potoken/PoTokenWebView.kt
index 76d2d9614..e951bdd60 100644
--- a/app/src/main/java/org/schabi/newpipe/util/potoken/PoTokenWebView.kt
+++ b/app/src/main/java/org/schabi/newpipe/util/potoken/PoTokenWebView.kt
@@ -346,7 +346,7 @@ class PoTokenWebView private constructor(
          */
         private fun runOnMainThread(
             emitterIfPostFails: SingleEmitter<out Any>,
-            runnable: () -> Unit,
+            runnable: Runnable,
         ) {
             if (!Handler(Looper.getMainLooper()).post(runnable)) {
                 emitterIfPostFails.onError(PoTokenException("Could not run on main thread"))