diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1b357747..4c22a100 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -94,7 +94,7 @@ packages:
         - exception-transformers
         - mainland-pretty
         - ref-fd
-        - srcloc
+        - srcloc < 0.6 # https://github.com/commercialhaskell/stackage/issues/5995
         - symbol
 
     "Patrick Bahr <paba@itu.dk>":