diff --git a/build-constraints.yaml b/build-constraints.yaml
index 69751408..a7a5e9b2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1148,6 +1148,9 @@ packages:
         - iso639
         - murmur-hash
         - monoidal-containers
+        - regex-pcre
+        - string-class
+        - string-combinators
 
     "Rob O'Callahan ropoctl@gmail.com":
         - pipes-fastx