diff --git a/guix-data-service/model/git-commit.scm b/guix-data-service/model/git-commit.scm
index 0e8f773..e8b00ff 100644
--- a/guix-data-service/model/git-commit.scm
+++ b/guix-data-service/model/git-commit.scm
@@ -43,5 +43,5 @@ ON CONFLICT DO NOTHING"
           conn
           "SELECT 1 FROM git_commits WHERE commit = $1"
           (list commit))
-    (#f #f)
+    (() #f)
     (_ #t)))