diff --git a/templates/machine.m.motemplate b/templates/machine.m.motemplate
index 5cdb4b35..f16a3767 100644
--- a/templates/machine.m.motemplate
+++ b/templates/machine.m.motemplate
@@ -74,6 +74,7 @@
 	return result;
 }
 + (id)fetch<$FetchRequest.name.initialCapitalString$>:(NSManagedObjectContext*)moc_ <$foreach Binding FetchRequest.bindings do2$><$Binding.name$>:(<$Binding.type$>)<$Binding.name$>_ <$endforeach do2$>error:(NSError**)error_ {
+	NSParameterAssert(moc_);
 	NSError *error = nil;
 	
 	NSManagedObjectModel *model = [[moc_ persistentStoreCoordinator] managedObjectModel];
@@ -122,6 +123,7 @@
 	return result;
 }
 + (NSArray*)fetch<$FetchRequest.name.initialCapitalString$>:(NSManagedObjectContext*)moc_ <$foreach Binding FetchRequest.bindings do2$><$Binding.name$>:(<$Binding.type$>)<$Binding.name$>_ <$endforeach do2$>error:(NSError**)error_ {
+	NSParameterAssert(moc_);
 	NSError *error = nil;
 	
 	NSManagedObjectModel *model = [[moc_ persistentStoreCoordinator] managedObjectModel];