diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
index c21bfd7f0c013..dc8d473fc82c8 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.sh
@@ -128,6 +128,7 @@ check_mark()
 	for v in $values; do
 		if [ $v -ne 0 ]; then
 			echo "FAIL: got $tables $values in ns $ns , not 0 - not all expected packets marked" 1>&2
+			ret=1
 			return 1
 		fi
 	done
@@ -227,11 +228,11 @@ do_transfer()
 	fi
 
 	if [ $local_addr = "::" ];then
-		check_mark $listener_ns 6
-		check_mark $connector_ns 6
+		check_mark $listener_ns 6 || retc=1
+		check_mark $connector_ns 6 || retc=1
 	else
-		check_mark $listener_ns 4
-		check_mark $connector_ns 4
+		check_mark $listener_ns 4 || retc=1
+		check_mark $connector_ns 4 || retc=1
 	fi
 
 	check_transfer $cin $sout "file received by server"