diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index e508d356fcdaeb..5e3c56253274a1 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -582,7 +582,7 @@ make_file()
 	mptcp_lib_make_file $name 1024 $ksize
 	dd if=/dev/urandom conv=notrunc of="$name" oflag=append bs=1 count=$rem 2> /dev/null
 
-	echo "Created $name (size $(du -b "$name")) containing data sent by $who"
+	echo "Created $name (size $(stat -c "%s" "$name") B) containing data sent by $who"
 }
 
 run_tests_lo()