diff --git a/Classes/CoreDataManager.m b/Classes/CoreDataManager.m
index aad793e..25c1f68 100644
--- a/Classes/CoreDataManager.m
+++ b/Classes/CoreDataManager.m
@@ -22,10 +22,13 @@
 
 #import "CoreDataManager.h"
 
+@interface CoreDataManager()
+@property (nonatomic, strong, readwrite) NSManagedObjectContext *managedObjectContext;
+@property (nonatomic, strong, readwrite) NSManagedObjectModel *managedObjectModel;
+@property (nonatomic, strong, readwrite) NSPersistentStoreCoordinator *persistentStoreCoordinator;
+@end
+
 @implementation CoreDataManager
-@synthesize managedObjectContext = _managedObjectContext;
-@synthesize managedObjectModel = _managedObjectModel;
-@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
 @synthesize databaseName = _databaseName;
 @synthesize modelName = _modelName;