diff --git a/lib/jekyll-open-sdg-plugins/schema-indicator-config.json b/lib/jekyll-open-sdg-plugins/schema-indicator-config.json
index 7db81741..8d61f34d 100644
--- a/lib/jekyll-open-sdg-plugins/schema-indicator-config.json
+++ b/lib/jekyll-open-sdg-plugins/schema-indicator-config.json
@@ -697,7 +697,7 @@
         "progress_status": {
             "type": "string",
             "title": "Progress status",
-            "enum": ["not_available", "challenges_remain", "approaching_target", "target_achieved"],
+            "enum": ["", "not_available", "challenges_remain", "approaching_target", "target_achieved"],
             "description": "The progress status of the indicator.",
             "links": [
                 {