diff --git a/kexec/arch/m68k/bootinfo.c b/kexec/arch/m68k/bootinfo.c
index 086a34bd..5afd212d 100644
--- a/kexec/arch/m68k/bootinfo.c
+++ b/kexec/arch/m68k/bootinfo.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 
 #include <stdio.h>
 #include <stdlib.h>