diff --git a/build-constraints.yaml b/build-constraints.yaml
index 500d8686..69ba9089 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3684,6 +3684,7 @@ expected-haddock-failures:
 # For packages with haddock issues
 skipped-haddocks:
 - language-puppet # https://github.com/fpco/stackage/issues/2822
+- approximate
 # end of skipped-haddocks
 
 # Benchmarks which should not be built. Note that Stackage builds benchmarks but does not run them.