diff --git a/deployments/examples/ocis_wopi/config/wopiserver/entrypoint-override.sh b/deployments/examples/ocis_wopi/config/wopiserver/entrypoint-override.sh
index 67f2b547f1..320527104f 100755
--- a/deployments/examples/ocis_wopi/config/wopiserver/entrypoint-override.sh
+++ b/deployments/examples/ocis_wopi/config/wopiserver/entrypoint-override.sh
@@ -12,6 +12,9 @@ sed -i 's/wopiserver.owncloud.test/'${WOPISERVER_DOMAIN}'/g' /etc/wopi/wopiserve
 
 touch /var/log/wopi/wopiserver.log
 
+# wait for collabora to be up, else file types might be missing at https://wopiserver.owncloud.test/wopi/cbox/endpoints
+while ! curl --output /dev/null --silent --head --fail http://collabora:9980; do sleep 1 && echo -n .; done;
+
 /app/wopiserver.py &
 
 tail -f /var/log/wopi/wopiserver.log