diff --git a/fcoe-utils.spec b/fcoe-utils.spec
index f2b36c58af4bd3d01366af4cac661a3488d0380c..329fabc26d6179a3f0277605c367040ce1c3c1c5 100644
--- a/fcoe-utils.spec
+++ b/fcoe-utils.spec
@@ -1,6 +1,6 @@
 Name:               fcoe-utils
 Version:            1.0.34
-Release:            1
+Release:            2
 Summary:            Fibre Channel over Ethernet utilities
 License:            GPLv2
 URL:                https://github.com/morbidrsa/fcoe-utils
@@ -27,7 +27,7 @@ cp -v %{SOURCE1} quickstart.txt
 
 %build
 %if "%toolchain" == "clang"
-    CFLAGS="$CFLAGS -Wno-error=format-nonliteral -Wno-error=strncat-size -Wno-error=strict-prototypes"
+    CFLAGS="$CFLAGS -Wno-error=format-nonliteral -Wno-error=strncat-size -Wno-error=strict-prototypes -O2"
 %endif
 
 ./bootstrap.sh
@@ -68,6 +68,9 @@ done
 %{_mandir}/man8/*
 
 %changelog
+* Mon Mar 11 2024 jchzhou <zhoujiacheng@iscas.ac.cn> - 1.0.34-2
+- Fix '_FORTIFY_SOURCE requires compiling with optimization' issue when building w/ clang
+
 * Sat Oct 07 2023 xu_ping <707078654@qq.com> - 1.0.34-1
 - Upgrade version to 1.0.34