diff --git a/Sources/ManagedModels/SchemaCompatibility/NSManagedObjectModel+Data.swift b/Sources/ManagedModels/SchemaCompatibility/NSManagedObjectModel+Data.swift
index d42b2c4..23231e0 100644
--- a/Sources/ManagedModels/SchemaCompatibility/NSManagedObjectModel+Data.swift
+++ b/Sources/ManagedModels/SchemaCompatibility/NSManagedObjectModel+Data.swift
@@ -37,8 +37,8 @@ public extension NSManagedObjectModel {
 // MARK: - Cached ManagedObjectModels
 
 private let lock = NSLock()
-private var map = [ Set<ObjectIdentifier> : NSManagedObjectModel ]()
-private let sharedBuilder = SchemaBuilder()
+nonisolated(unsafe) private var map = [ Set<ObjectIdentifier> : NSManagedObjectModel ]()
+nonisolated(unsafe) private let sharedBuilder = SchemaBuilder()
 
 public extension NSManagedObjectModel {
   
diff --git a/Sources/ManagedModels/SwiftUI/ModelContainer+SwiftUI.swift b/Sources/ManagedModels/SwiftUI/ModelContainer+SwiftUI.swift
index c8e5a89..9ff8195 100644
--- a/Sources/ManagedModels/SwiftUI/ModelContainer+SwiftUI.swift
+++ b/Sources/ManagedModels/SwiftUI/ModelContainer+SwiftUI.swift
@@ -113,7 +113,7 @@ public extension Scene {
 // MARK: - Primitive
 
 // Note: The docs say that a container is only ever created once! So cache it.
-private var modelToContainer = [ ObjectIdentifier: NSPersistentContainer ]()
+nonisolated(unsafe) private var modelToContainer = [ ObjectIdentifier: NSPersistentContainer ]()
 
 private func makeModelContainer(
   for    modelTypes : [ any PersistentModel.Type ],