diff --git a/pkg/api/flamenco-openapi.yaml b/pkg/api/flamenco-openapi.yaml
index 784360f2..77570c71 100644
--- a/pkg/api/flamenco-openapi.yaml
+++ b/pkg/api/flamenco-openapi.yaml
@@ -444,8 +444,7 @@ paths:
           content:
             text/plain:
               schema:
-                type: array
-                items: { type: string }
+                type: string
         default:
           description: Unexpected error.
           content: