diff --git a/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt b/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt
index e488dbdb4..6bc63a56a 100644
--- a/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt
+++ b/app/src/main/java/org/schabi/newpipe/settings/ContentSettingsManager.kt
@@ -91,9 +91,10 @@ class ContentSettingsManager(private val fileLocator: NewPipeFileLocator) {
                         is String -> {
                             preferenceEditor.putString(key, value)
                         }
-                        is HashSet<*> -> {
+                        is Set<*> -> {
+                            // There are currently only Sets with type String possible
                             @Suppress("UNCHECKED_CAST")
-                            preferenceEditor.putStringSet(key, value as MutableSet<String>?)
+                            preferenceEditor.putStringSet(key, value as Set<String>?)
                         }
                     }
                 }