diff --git a/roles/pkgdb-proxy/files/pkgdb-gnome-software.conf b/roles/pkgdb-proxy/files/pkgdb-gnome-software.conf
index 2c7e1946db..a2c87b14a1 100644
--- a/roles/pkgdb-proxy/files/pkgdb-gnome-software.conf
+++ b/roles/pkgdb-proxy/files/pkgdb-gnome-software.conf
@@ -1 +1,9 @@
+#
+# Do not use MTime for the ETag here, because the mtime of the file
+# on the different proxies makes them return different ETags
+# Instead use Digest and Size to tell when the file has changed.
+#
+<Files pkgdb-gnome-software-collections.json>
+FileETag Size Digest
+</Files>
 AliasMatch ^/pkgdb/api/collections/? /srv/web/pkgdb-gnome-software-collections.json