diff --git a/usr/include/sys/prctl.h b/usr/include/sys/prctl.h
index 71ba57e..c12c191 100644
--- a/usr/include/sys/prctl.h
+++ b/usr/include/sys/prctl.h
@@ -1,9 +1,10 @@
 #ifndef _SYS_PRCTL_H
 #define _SYS_PRCTL_H
 
+#include <klibc/extern.h>
 #include <linux/prctl.h>
 
 /* glibc has this as a varadic function, so join the club... */
-int prctl(int, ...);
+__extern int prctl(int, ...);
 
 #endif /* _SYS_PRCTL_H */