diff --git a/build-constraints.yaml b/build-constraints.yaml
index 69c655b9..ac90b259 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6084,6 +6084,7 @@ packages:
         - cassava-records < 0 # MonadFail
         - haskell-spacegoo < 0 # MonadFail
         - lens-typelevel < 0 # Wrong category of family instance (wat)
+        - regex-pcre-builtin < 0 # MonadFail
 
         # Round 2 transitive from Some more failures
         - Clipboard < 0 # via X11