diff --git a/backport-kronosnet-fix-format-truncation.patch b/backport-kronosnet-fix-format-truncation.patch
new file mode 100644
index 0000000..2f9a158
--- /dev/null
+++ b/backport-kronosnet-fix-format-truncation.patch
@@ -0,0 +1,31 @@
+diff -urN a/libknet/host.c b/libknet/host.c
+
+--- a/libknet/host.c	2021-08-04 10:17:01.912099056 +0800
++++ b/libknet/host.c	2021-08-04 10:17:55.708739020 +0800
+@@ -77,7 +77,7 @@
+ 	/*
+ 	 * set default host->name to host_id for logging
+ 	 */
+-	snprintf(host->name, KNET_MAX_HOST_LEN - 1, "%u", host_id);
++	snprintf(host->name, KNET_MAX_HOST_LEN, "%u", host_id);
+ 
+ 	/*
+ 	 * initialize links internal data
+@@ -226,7 +226,7 @@
+ 	}
+ 
+ 	for (host = knet_h->host_head; host != NULL; host = host->next) {
+-		if (!strncmp(host->name, name, KNET_MAX_HOST_LEN - 1)) {
++		if (!strncmp(host->name, name, KNET_MAX_HOST_LEN)) {
+ 			err = -1;
+ 			savederrno = EEXIST;
+ 			log_err(knet_h, KNET_SUB_HOST, "Duplicated name found on host_id %u",
+@@ -235,7 +235,7 @@
+ 		}
+ 	}
+ 
+-	snprintf(knet_h->host_index[host_id]->name, KNET_MAX_HOST_LEN - 1, "%s", name);
++	snprintf(knet_h->host_index[host_id]->name, KNET_MAX_HOST_LEN, "%s", name);
+ 
+ exit_unlock:
+ 	pthread_rwlock_unlock(&knet_h->global_rwlock);
diff --git a/kronosnet.spec b/kronosnet.spec
index 4995c0d..5ca5763 100644
--- a/kronosnet.spec
+++ b/kronosnet.spec
@@ -20,7 +20,7 @@
 Name:                kronosnet
 Summary:             Multipoint-to-Multipoint VPN daemon
 Version:             1.13
-Release:             2
+Release:             3
 License:             GPLv2+ and LGPLv2+
 URL:                 https://kronosnet.org
 Source0:             https://kronosnet.org/releases/%{name}-%{version}.tar.xz
@@ -65,8 +65,10 @@ BuildRequires:       libnl3-devel
 BuildRequires:       autoconf automake libtool
 %endif
 
+Patch0001:	backport-kronosnet-fix-format-truncation.patch
+
 %prep
-%setup -q -n %{name}-%{version}
+%autosetup -n kronosnet-%{version} -p1
 
 %build
 %if %{with runautogen}
@@ -434,5 +436,8 @@ Requires:            libknet1%{_isa} = %{version}-%{release}
 %endif
 
 %changelog
+* Wed Aug 04 2021 Liu Yinsi <liuyinsi@163.com> - 1.13-3
+- fix format-truncation to support gcc 10
+
 * Sat Jul 18 2020 yanan li <liyanan032@huawei.com> - 1.13-2
 - Package init