diff --git a/scripts/test.sh b/scripts/test.sh
index bf7b2870..8be34534 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -75,6 +75,7 @@ fi
 
 echo "+ Mamba does not warn (check that there is no warning on stderr)"
 mamba --help 2> stderr.log
+cat stderr.log
 test ! -s stderr.log
 rm -f stderr.log