diff --git a/guix-data-service/web/revision/controller.scm b/guix-data-service/web/revision/controller.scm
index b22fbed..9d900d7 100644
--- a/guix-data-service/web/revision/controller.scm
+++ b/guix-data-service/web/revision/controller.scm
@@ -545,11 +545,12 @@
                 system-tests))))))
       (else
        (fibers-let ((git-repositories
-                  (with-resource-from-pool (connection-pool) conn
-                    (git-repositories-containing-commit conn
-                                                        commit-hash)))
-                 (systems
-                  (with-resource-from-pool (connection-pool) conn list-systems)))
+                     (with-resource-from-pool (connection-pool) conn
+                       (git-repositories-containing-commit conn
+                                                           commit-hash)))
+                    (systems
+                     (call-with-resource-from-pool (connection-pool)
+                       list-systems)))
          (render-html
           #:sxml (view-revision-system-tests
                   commit-hash