diff --git a/common/common-cpu.h b/common/common-cpu.h
index 3c8df27c..ccc8ed44 100644
--- a/common/common-cpu.h
+++ b/common/common-cpu.h
@@ -31,6 +31,8 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #pragma once
 
+#define _GNU_SOURCE
+
 #include <sched.h>
 #include <stdlib.h>