diff --git a/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb b/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb
index b314544349..370b339d45 100644
--- a/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb
+++ b/db/migrate/20160320204112_index_namespaces_on_visibility_level.rb
@@ -1,5 +1,7 @@
 class IndexNamespacesOnVisibilityLevel < ActiveRecord::Migration
   def change
-    add_index :namespaces, :visibility_level
+    unless index_exists?(:namespaces, :visibility_level)
+      add_index :namespaces, :visibility_level
+    end
   end
 end