diff --git a/include/haproxy/cpuset-t.h b/include/haproxy/cpuset-t.h
index f1c532d2e..6bc29af41 100644
--- a/include/haproxy/cpuset-t.h
+++ b/include/haproxy/cpuset-t.h
@@ -1,3 +1,6 @@
+#ifndef _HAPROXY_CPUSET_T_H
+#define _HAPROXY_CPUSET_T_H
+
 #define _GNU_SOURCE
 #include <sched.h>
 
@@ -9,9 +12,6 @@
 #endif
 #endif
 
-#ifndef _HAPROXY_CPUSET_T_H
-#define _HAPROXY_CPUSET_T_H
-
 #if defined(__linux__) || defined(__DragonFly__)
 
 # define CPUSET_REPR cpu_set_t