diff --git a/src/conf/sysconf.c b/src/conf/sysconf.c
index 5199ed29..3baaed32 100644
--- a/src/conf/sysconf.c
+++ b/src/conf/sysconf.c
@@ -5,6 +5,7 @@
 #include <signal.h>
 #include <sys/sysinfo.h>
 #include "syscall.h"
+#include "libc.h"
 
 #define JT(x) (-256|(x))
 #define VER JT(1)