diff --git a/src/os/linux/linux_sigar.c b/src/os/linux/linux_sigar.c
index eeb2921a..ec67b1c2 100644
--- a/src/os/linux/linux_sigar.c
+++ b/src/os/linux/linux_sigar.c
@@ -45,6 +45,9 @@
 #define PROC_PARTITIONS PROC_FS_ROOT "partitions"
 #define PROC_DISKSTATS  PROC_FS_ROOT "diskstats"
 
+/* Native POSIX Thread Library 2.6+ kernel */
+#define SIGAR_HAS_NPTL (sigar->iostat == IOSTAT_DISKSTATS)
+
 /*
  * /proc/self/stat fields:
  * 1 - pid
@@ -210,9 +213,6 @@ char *sigar_os_error_string(sigar_t *sigar, int err)
     return NULL;
 }
 
-/* Native POSIX Thread Library 2.6+ kernel */
-#define SIGAR_HAS_NPTL (sigar->iostat == IOSTAT_DISKSTATS)
-
 static int sigar_cpu_total_count(sigar_t *sigar)
 {
     sigar->ncpu = (int)sysconf(_SC_NPROCESSORS_CONF);