diff --git a/app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/MediaFetcher.kt b/app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/MediaFetcher.kt
index 8d381eeed..c87341fca 100644
--- a/app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/MediaFetcher.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/MediaFetcher.kt
@@ -178,7 +178,7 @@ class MediaFetcher(val context: Context) {
         val showHidden = config.shouldShowHidden
         val excludedFolders = config.excludedFolders
         foldersToScan = foldersToScan.filter { it.shouldFolderBeVisible(excludedFolders, includedFolders, showHidden) } as ArrayList<String>
-        return foldersToScan.distinctBy { it.getDistinctPath() }.toSet() as LinkedHashSet<String>
+        return foldersToScan.distinctBy { it.getDistinctPath() }.toMutableSet() as LinkedHashSet<String>
     }
 
     private fun addFolder(curFolders: ArrayList<String>, folder: String) {