diff --git a/android/app/src/main/kotlin/dev/imranr/obtainium/MainActivity.kt b/android/app/src/main/kotlin/dev/imranr/obtainium/MainActivity.kt
index 72c22cb..af2da43 100644
--- a/android/app/src/main/kotlin/dev/imranr/obtainium/MainActivity.kt
+++ b/android/app/src/main/kotlin/dev/imranr/obtainium/MainActivity.kt
@@ -30,19 +30,20 @@ class MainActivity: FlutterActivity() {
     private var installersChannel: MethodChannel? = null
     private val SHIZUKU_PERMISSION_REQUEST_CODE = (10..200).random()
 
-    private fun shizukuCheckPermission() {
+    private fun shizukuCheckPermission(result: Result) {
         try {
             if (Shizuku.isPreV11()) {  // Unsupported
-                installersChannel!!.invokeMethod("resPermShizuku", mapOf("res" to -1))
+                result.success(-1)
             } else if (Shizuku.checkSelfPermission() == PackageManager.PERMISSION_GRANTED) {
-                installersChannel!!.invokeMethod("resPermShizuku", mapOf("res" to 1))
+                result.success(1)
             } else if (Shizuku.shouldShowRequestPermissionRationale()) {  // Deny and don't ask again
-                installersChannel!!.invokeMethod("resPermShizuku", mapOf("res" to 0))
+                result.success(0)
             } else {
                 Shizuku.requestPermission(SHIZUKU_PERMISSION_REQUEST_CODE)
+                result.success(-2)
             }
         } catch (_: Exception) {  // If shizuku not running
-            installersChannel!!.invokeMethod("resPermShizuku", mapOf("res" to -1))
+            result.success(-1)
         }
     }
 
@@ -150,8 +151,7 @@ class MainActivity: FlutterActivity() {
         installersChannel!!.setMethodCallHandler {
             call, result ->
             if (call.method == "checkPermissionShizuku") {
-                shizukuCheckPermission()
-                result.success(0)
+                shizukuCheckPermission(result)
             } else if (call.method == "checkPermissionRoot") {
                 rootCheckPermission(result)
             } else if (call.method == "installWithShizuku") {
diff --git a/lib/providers/installers_provider.dart b/lib/providers/installers_provider.dart
index b8ecd2e..c42e1b0 100644
--- a/lib/providers/installers_provider.dart
+++ b/lib/providers/installers_provider.dart
@@ -7,7 +7,7 @@ class Installers {
   static int _resPermShizuku = -2;  // not set
 
   static Future waitWhile(bool Function() test,
-      [Duration pollInterval = const Duration(milliseconds: 100)]) {
+      [Duration pollInterval = const Duration(milliseconds: 250)]) {
     var completer = Completer();
     check() {
       if (test()) {
@@ -31,10 +31,12 @@ class Installers {
       _channel.setMethodCallHandler(handleCalls);
       _callbacksApplied = true;
     }
-    await _channel.invokeMethod('checkPermissionShizuku');
-    await waitWhile(() => _resPermShizuku == -2);
-    int res = _resPermShizuku;
-    _resPermShizuku = -2;
+    int res = await _channel.invokeMethod('checkPermissionShizuku');
+    if(res == -2) {
+      await waitWhile(() => _resPermShizuku == -2);
+      res = _resPermShizuku;
+      _resPermShizuku = -2;
+    }
     return res;
   }