diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2c38e413..d2fc615c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -600,7 +600,7 @@ packages:
         - packcheck
         - streamly < 0 # primitive 0.7.1.0
         - unicode-transforms
-        - xls
+        - xls < 0 # https://github.com/harendra-kumar/xls/issues/7
 
     "Pranay Sashank <pranaysashank@gmail.com> @pranaysashank":
         - fusion-plugin-types