diff --git a/libc/unistd/setgid.cpp b/libc/unistd/setgid.cpp
index e21ff680..dc7ac7e8 100644
--- a/libc/unistd/setgid.cpp
+++ b/libc/unistd/setgid.cpp
@@ -27,7 +27,7 @@
 
 #include <unistd.h>
 
-DEFN_SYSCALL1(gid_t, sys_setgid, SYSCALL_GETGID, gid_t);
+DEFN_SYSCALL1(gid_t, sys_setgid, SYSCALL_SETGID, gid_t);
 
 extern "C" int setgid(gid_t gid)
 {