1 files changed, 1 insertions, 0 deletions

diff --git a/syscall.h b/syscall.h
index f4b7807..3a0fbca 100644
--- a/syscall.h
+++ b/syscall.h
@@ -19,3 +19,4 @@
 #define SYS_getpid 18
 #define SYS_sbrk   19
 #define SYS_sleep  20
+#define SYS_uptime 21