diff --git a/src/test/test_linux_dhcp_dns.c b/src/test/test_linux_dhcp_dns.c
index b7e92df..049a184 100644
--- a/src/test/test_linux_dhcp_dns.c
+++ b/src/test/test_linux_dhcp_dns.c
@@ -266,6 +266,8 @@ int main(int argc, char **argv)
     /* Client side test */
     test_femtotcp_echoclient(s);
 
+    sleep(2);
+    sync();
     system("killall tcpdump");
     return 0;
 }