diff --git a/NSManagedObjectContext+ActiveRecord.m b/NSManagedObjectContext+ActiveRecord.m
index 3729982d9..f501c10c1 100644
--- a/NSManagedObjectContext+ActiveRecord.m
+++ b/NSManagedObjectContext+ActiveRecord.m
@@ -30,8 +30,10 @@ + (NSManagedObjectContext *)defaultContext
 
 + (void) setDefaultContext:(NSManagedObjectContext *)moc
 {
-	[defaultManageObjectContext release];
-	defaultManageObjectContext = [moc retain];
+	if (defaultManageObjectContext != moc) {
+		[defaultManageObjectContext release];
+		defaultManageObjectContext = [moc retain];
+	}
 }
 
 + (void) resetDefaultContext