diff --git a/build-constraints.yaml b/build-constraints.yaml
index d48c9a91..9cf8a352 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8195,6 +8195,7 @@ skipped-tests:
     - aern2-mp            # https://github.com/michalkonecny/aern2/issues/11
 
     # ???
+    - chronos # 1.1.5 chronos-test:  executable not found
     - incremental-parser # 0.5.0.3 Main: executable not found
     - streamt # executable not found