diff --git a/config/initializers/_before_load_services.rb b/config/initializers/_before_load_services.rb
index 8f29b895b..48461e91a 100644
--- a/config/initializers/_before_load_services.rb
+++ b/config/initializers/_before_load_services.rb
@@ -13,6 +13,6 @@ SERVICES = nil
 silence_warnings do
   SERVICES = load_config_yaml("#{oauth_keys_file}.example")
   if File.exist? oauth_keys_file
-    SERVICES.deep_merge(load_config_yaml(oauth_keys_file))
+    SERVICES.deep_merge!(load_config_yaml(oauth_keys_file))
   end
 end