diff --git a/scripts/test.sh b/scripts/test.sh
index c88b374..ece78b1 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# Reclaim age-expired build/test caches before building. No-op when the shared
+# helper is not installed, so CI and other machines are unaffected.
+command -v disk-clean >/dev/null 2>&1 && disk-clean || true
+
 echo "=== fmt ==="
 cargo fmt --all