diff --git a/app/src/main/java/org/kiwix/kiwixmobile/zimManager/Fat32Checker.kt b/app/src/main/java/org/kiwix/kiwixmobile/zimManager/Fat32Checker.kt
index 1efd55125..3e681400c 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/zimManager/Fat32Checker.kt
+++ b/app/src/main/java/org/kiwix/kiwixmobile/zimManager/Fat32Checker.kt
@@ -62,8 +62,8 @@ class Fat32Checker constructor(
       )
   }
 
-  private fun fileObserver(it: String?): FileObserver {
-    return object : FileObserver(it, MOVED_FROM or DELETE) {
+  private fun fileObserver(it: String): FileObserver {
+    return object : FileObserver(File(it), MOVED_FROM or DELETE) {
       override fun onEvent(event: Int, path: String?) {
         requestCheckSystemFileType.onNext(Unit)
       }