diff --git a/overviewer/run-overviewer.sh b/overviewer/run-overviewer.sh
index 68da979..925b655 100755
--- a/overviewer/run-overviewer.sh
+++ b/overviewer/run-overviewer.sh
@@ -3,7 +3,7 @@
 SLEEP=${1}
 
 function update_map() {
-  overviewer.py --config=/config.py
+  overviewer.py --config=/config.py --check-tiles
   sed -i "s/sensor=false/key=${GOOGLE_MAPS_API_KEY}\&sensor=false/" /map/index.html
 }