diff --git a/xCAT-probe/xCAT-probe.spec b/xCAT-probe/xCAT-probe.spec
index 1fa41ccf3..5a2579641 100644
--- a/xCAT-probe/xCAT-probe.spec
+++ b/xCAT-probe/xCAT-probe.spec
@@ -21,6 +21,8 @@ BuildArch: noarch
 Requires: /usr/bin/nslookup
 Requires: /usr/bin/tftp
 Requires: /usr/bin/wget
+# Tool detect_dhcpd requires tcpdump
+Requires: /usr/sbin/tcpdump
 %endif
 
 %description
@@ -57,6 +59,8 @@ rm -rf $RPM_BUILD_ROOT
 %{prefix}
 
 %changelog
+* Thu, 30 Aug 2018 - GONG Jie <gongjie@linux.vnet.ibm.com>
+- Add /usr/sbin/tcpdump as requirement
 * Fri Jul 1 2016 - huweihua <huweihua@cn.ibm.com>
 - "Create xCAT probe package"