diff --git a/AltStoreCore/Model/AltStore.xcdatamodeld/AltStore 13.xcdatamodel/contents b/AltStoreCore/Model/AltStore.xcdatamodeld/AltStore 13.xcdatamodel/contents
index c80ebb34..e99bcc3e 100644
--- a/AltStoreCore/Model/AltStore.xcdatamodeld/AltStore 13.xcdatamodel/contents	
+++ b/AltStoreCore/Model/AltStore.xcdatamodeld/AltStore 13.xcdatamodel/contents	
@@ -30,7 +30,7 @@
         <attribute name="appBundleID" optional="YES" attributeType="String"/>
         <attribute name="permission" attributeType="String"/>
         <attribute name="type" attributeType="String"/>
-        <attribute name="usageDescription" optional="YES" attributeType="String"/>
+        <attribute name="usageDescription" attributeType="String"/>
         <relationship name="app" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="StoreApp" inverseName="permissions" inverseEntity="StoreApp"/>
         <uniquenessConstraints>
             <uniquenessConstraint>
diff --git a/AltStoreCore/Model/AppPermission.swift b/AltStoreCore/Model/AppPermission.swift
index d1a80804..6b220351 100644
--- a/AltStoreCore/Model/AppPermission.swift
+++ b/AltStoreCore/Model/AppPermission.swift
@@ -16,7 +16,14 @@ public class AppPermission: NSManagedObject, Decodable, Fetchable
 {
     /* Properties */
     @NSManaged public var type: ALTAppPermissionType
-    @NSManaged public var usageDescription: String?
+    
+    // usageDescription must be non-optional for backwards compatibility,
+    // so we store non-optional value and provide public accessor with optional return type.
+    @nonobjc public var usageDescription: String? {
+        get { _usageDescription.isEmpty ? nil : _usageDescription }
+        set { _usageDescription = newValue ?? "" }
+    }
+    @NSManaged @objc(usageDescription) private var _usageDescription: String
     
     @nonobjc public var permission: any ALTAppPermission {
         switch self.type