diff --git a/kexec-tools.changes b/kexec-tools.changes
index cbfab00..68f83ad 100644
--- a/kexec-tools.changes
+++ b/kexec-tools.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Jan  1 01:01:01 UTC 2025 - olaf@aepfle.de
+
+- force -std=gnu99 because C99 because the code uses features 
+
 -------------------------------------------------------------------
 Mon Dec 30 14:17:03 UTC 2024 - Petr Tesařík <ptesarik@suse.com>
 
diff --git a/kexec-tools.spec b/kexec-tools.spec
index 02df4bd..18c2c99 100644
--- a/kexec-tools.spec
+++ b/kexec-tools.spec
@@ -67,8 +67,8 @@ the loaded kernel after it panics.
 
 %build
 autoreconf -fvi
-export CFLAGS="%{optflags} -fPIC"
-export BUILD_CFLAGS="%{optflags}"
+export CFLAGS="%{optflags} -fPIC -std=gnu99"
+export BUILD_CFLAGS="%{optflags} -std=gnu99"
 export LDFLAGS="-pie"
 %configure
 %make_build