diff --git a/gcc-9-stricter-on-NULL-arguments-for-printf.patch b/gcc-9-stricter-on-NULL-arguments-for-printf.patch
new file mode 100644
index 0000000000000000000000000000000000000000..4028ab1ecd1a04fdb476f5024cff43c110723c44
--- /dev/null
+++ b/gcc-9-stricter-on-NULL-arguments-for-printf.patch
@@ -0,0 +1,43 @@
+From 6fa1497436693b2a2d8577dcae86a2bebca5b3f3 Mon Sep 17 00:00:00 2001
+From: chengzihan2 <chengzihan1111@163.com>
+Date: Tue, 2 Jun 2020 10:57:02 +0800
+Subject: [PATCH] gcc-9 stricter on NULL arguments for printf
+
+---
+ lib/libvarnish/vnum.c | 20 +++++++++++---------
+ 1 file changed, 11 insertions(+), 9 deletions(-)
+
+diff --git a/lib/libvarnish/vnum.c b/lib/libvarnish/vnum.c
+index 6caf931..2611768 100644
+--- a/lib/libvarnish/vnum.c
++++ b/lib/libvarnish/vnum.c
+@@ -348,15 +348,17 @@ main(int argc, char *argv[])
+ 
+ 	for (tc = test_cases; tc->str; ++tc) {
+ 		e = VNUM_2bytes(tc->str, &val, tc->rel);
+-		if (e != tc->err) {
+-			printf("%s: VNUM_2bytes(\"%s\", %ju) (%s) != (%s)\n",
+-			    *argv, tc->str, tc->rel, tc->err, e);
+-			++ec;
+-		} else if (e == NULL && val != tc->val) {
+-			printf("%s: VNUM_2bytes(\"%s\", %ju) %ju != %ju (%s)\n",
+-			    *argv, tc->str, tc->rel, val, tc->val, e);
+-			++ec;
+-		}
++		if (e != NULL)
++			val = 0;
++		if (e == tc->err && val == tc->val)
++			continue;
++		++ec;
++		printf("%s: VNUM_2bytes(\"%s\", %ju)\n",
++		   *argv, tc->str, tc->rel);
++		printf("\tExpected:\tstatus %s - value %ju\n",
++		    tc->err ? tc->err : "Success", tc->val);
++		printf("\tGot:\t\tstatus %s - value %ju\n",
++		    e ? e : "Success", val);
+ 	}
+ 	if (!isnan(VNUM_duration(NULL))) {
+ 		printf("%s: VNUM_Duration(NULL) fail\n", *argv);
+-- 
+2.23.0
+
diff --git a/varnish.spec b/varnish.spec
index 1eefd1091ad26e24321e9509227f6ca6fb28e72d..b4f9141202ba7337a01c965cf5736ad919a8ea01 100644
--- a/varnish.spec
+++ b/varnish.spec
@@ -1,7 +1,7 @@
 Name:             varnish
 Summary:          A web application accelerator
 Version:          6.0.0
-Release:          4
+Release:          5
 License:          BSD
 URL:              https://www.varnish-cache.org/
 Source0:          http://varnish-cache.org/_downloads/varnish-%{version}.tgz
@@ -10,6 +10,7 @@ Source0:          http://varnish-cache.org/_downloads/varnish-%{version}.tgz
 Source1:          https://github.com/varnishcache/pkg-varnish-cache/archive/0ad2f22629c4a368959c423a19e352c9c6c79682/pkg-varnish-cache-0ad2f22.tar.gz
 
 Patch0001:        varnish-5.1.1.fix_ld_library_path_in_doc_build.patch
+Patch0002:        gcc-9-stricter-on-NULL-arguments-for-printf.patch
 
 BuildRequires:    python3-sphinx python3-docutils pkgconfig make graphviz nghttp2 systemd-units
 BuildRequires:    ncurses-devel pcre-devel libedit-devel
@@ -157,5 +158,8 @@ test -f /etc/varnish/secret || (uuidgen > /etc/varnish/secret && chmod 0600 /etc
 %{_mandir}/man7/*.7*
 
 %changelog
+* Tue Jun 2 2020 chengzihan <chengzihan2@huawei.com> - 6.0.0-5
+- Fix the error of using parameter ("%s", NULL) for 'printf' when built by gcc-9
+
 * Mon Feb 10 2020 wangye <wangye54@huawei.com> - 6.0.0-4
 - Init package