diff --git a/packages/neos-ui-sagas/src/UI/FlashMessages/index.ts b/packages/neos-ui-sagas/src/UI/FlashMessages/index.ts
index dd3dcee4cd..a40562f094 100644
--- a/packages/neos-ui-sagas/src/UI/FlashMessages/index.ts
+++ b/packages/neos-ui-sagas/src/UI/FlashMessages/index.ts
@@ -21,7 +21,7 @@ export function * legacy__redirectReduxFlashMessagesToHighLevelApiCall() {
             showFlashMessage({
                 id: action.payload.id,
                 message: action.payload.message,
-                severity: action.payload.severity as Severity,
+                severity: action.payload.severity.toLowerCase() as Severity,
                 timeout: action.payload.timeout
             });
         }