diff --git a/tests/df/no-mtab-status-masked-proc.sh b/tests/df/no-mtab-status-masked-proc.sh
index bf9981e3c..11975ea20 100755
--- a/tests/df/no-mtab-status-masked-proc.sh
+++ b/tests/df/no-mtab-status-masked-proc.sh
@@ -29,7 +29,7 @@ unshare -rm true || skip_ 'User namespace sandbox is disabled'
 
 # mask /proc
 df() {
-  unshare -rm bash -c \
+  unshare -rm $SHELL -c \
     "mount -t tmpfs tmpfs /proc && command df \"\$@\"" -- "$@";
 }