diff --git a/gepi/gepi-webapp/src/main/java/de/julielab/gepi/webapp/services/AppModule.java b/gepi/gepi-webapp/src/main/java/de/julielab/gepi/webapp/services/AppModule.java
index 09fdf468..62adc013 100644
--- a/gepi/gepi-webapp/src/main/java/de/julielab/gepi/webapp/services/AppModule.java
+++ b/gepi/gepi-webapp/src/main/java/de/julielab/gepi/webapp/services/AppModule.java
@@ -86,7 +86,7 @@ public static void contributeFactoryDefaults(
         configuration.override(SymbolConstants.CORS_ALLOWED_ORIGINS, "*");
         configuration.override(SymbolConstants.CORS_ALLOW_CREDENTIALS, "true");
         configuration.override(SymbolConstants.CORS_EXPOSE_HEADERS, "X-Custom-Header");
-        configuration.override(SymbolConstants.CORS_MAX_AGE, "3600");
+        configuration.add(SymbolConstants.CORS_MAX_AGE, "3600");
     }
 
     public static void contributeApplicationDefaults(