diff --git a/hydra/modules/sysadmin/services.scm b/hydra/modules/sysadmin/services.scm
index 10b3f7b..69d23a1 100644
--- a/hydra/modules/sysadmin/services.scm
+++ b/hydra/modules/sysadmin/services.scm
@@ -447,6 +447,7 @@
            (cuirass-configuration
             (cuirass cuirass-without-fiber-tests)
             (interval (* 5 60))
+            (queue-size 100)
             (ttl (quotient nar-ttl 2))
             (specifications (cuirass-specs branches systems))
             (queries-log-file "/var/log/cuirass-sql.log")