diff --git a/build-constraints.yaml b/build-constraints.yaml
index af7c3456..4a3f5d30 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7419,6 +7419,9 @@ packages:
         - hledger-iadd < 0 # 1.3.17 bounds
         - hledger-interest < 0 # 1.6.3 bounds
 
+        # https://github.com/commercialhaskell/stackage/issues/6608
+        - tls < 1.6.0
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of