diff --git a/routemaster/feeds.py b/routemaster/feeds.py
index ea1ff6cc..f42851ce 100644
--- a/routemaster/feeds.py
+++ b/routemaster/feeds.py
@@ -42,6 +42,7 @@ def prefetch(self, label: str):
         )
 
         response = requests.get(url)
+        response.raise_for_status()
         self.data = response.json()
 
     def lookup(self, path):