diff --git a/build-constraints.yaml b/build-constraints.yaml
index 868ca4cc..00f77e17 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5946,6 +5946,9 @@ expected-test-failures:
 
     # https://github.com/clash-lang/clash-compiler/issues/1622
     - clash-prelude
+
+    # doctest: rio
+    - headroom
 # end of expected-test-failures
 
 # Benchmarks which are known not to build. Note that, currently we do not run