diff --git a/build-constraints.yaml b/build-constraints.yaml
index 40414d8e..9ff3fef3 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -685,6 +685,7 @@ packages:
         # GHC 8 - ekg-json
 
     "Paul Rouse <pgr@doynton.org>":
+        - sphinx
         - yesod-auth-hashdb
 
     "Toralf Wittner <tw@dtex.org> @twittner":