diff --git a/libc/include/sys/sysconf.h b/libc/include/sys/sysconf.h
index 0a46e7a..3d058d7 100644
--- a/libc/include/sys/sysconf.h
+++ b/libc/include/sys/sysconf.h
@@ -129,7 +129,7 @@
 #define _SC_AVPHYS_PAGES                0x0063
 #define _SC_MONOTONIC_CLOCK             0x0064
 
-extern int sysconf(int name);
+long sysconf(int);
 
 __END_DECLS