diff --git a/sponsorblockcast/config.json b/sponsorblockcast/config.json
index a83c454cb..e751a9883 100644
--- a/sponsorblockcast/config.json
+++ b/sponsorblockcast/config.json
@@ -23,11 +23,11 @@
   },
   "schema": {
     "CSS_CATEGORIES": "str",
-    "CSS_DISCOVER_INTERVAL": "str",
-    "CSS_PAUSED_INTERVAL": "str",
-    "CSS_PLAYING_INTERVAL": "str",
-    "CSS_YOUTUBE_API_KEY": "str",
-    "CSS_MUTE_ADS": "bool"
+    "CSS_DISCOVER_INTERVAL": "str?",
+    "CSS_PAUSED_INTERVAL": "str?",
+    "CSS_PLAYING_INTERVAL": "str?",
+    "CSS_YOUTUBE_API_KEY": "str?",
+    "CSS_MUTE_ADS": "bool?"
   },
   "slug": "sponsorblockcast",
   "url": "https://github.com/alexbelgium/hassio-addons/tree/master/sponsorblockcast",