diff --git a/tests/test-transaction-rollback-on-sigpipe.t b/tests/test-transaction-rollback-on-sigpipe.t
--- a/tests/test-transaction-rollback-on-sigpipe.t
+++ b/tests/test-transaction-rollback-on-sigpipe.t
@@ -24,7 +24,7 @@
 
   $ cat >remote/.hg/hgrc <<EOF
   > [hooks]
-  > pretxnchangegroup.00-break-things="$RUNTESTDIR/testlib/wait-on-file" 10 "$SYNCFILE2" "$SYNCFILE1"
+  > pretxnchangegroup.00-break-things=sh "$RUNTESTDIR/testlib/wait-on-file" 10 "$SYNCFILE2" "$SYNCFILE1"
   > pretxnchangegroup.01-output-things=echo "some remote output to be forward to the closed pipe"
   > EOF