diff --git a/sys/include/posix.h b/sys/include/posix.h
index 5de90cc..19afe8d 100644
--- a/sys/include/posix.h
+++ b/sys/include/posix.h
@@ -143,7 +143,6 @@ extern unsigned int POSIX_sleep(unsigned int seconds);
 extern int POSIX_pipe(int *errnop, int fildes[2]);
 extern int POSIX_umask(int *errnop, int mask);
 
-extern int POSIX_getpgrp(int *errnop);
 extern int POSIX_getuid(int *errnop);
 extern int POSIX_geteuid(int *errnop);
 extern int POSIX_setuid(int *errnop, int uid);
@@ -154,6 +153,8 @@ extern int POSIX_getegid(int *errnop);
 extern int POSIX_setgid(int *errnop, int gid);
 extern int POSIX_setegid(int *errnop, int egid);
 extern int POSIX_setregid(int *errnop, int rgid, int egid);
+extern int POSIX_getpgrp(int *errnop);
+extern int POSIX_getpgid(int *errnop, int pid);
 extern int POSIX_setpgid(int *errnop, int pid, int pgid);
 extern int POSIX_getsid(int *errnop, int pid);
 extern int POSIX_setsid(int *errnop);
diff --git a/sys/src/lib/posix/ids.c b/sys/src/lib/posix/ids.c
index 2a30d25..fcc84fb 100644
--- a/sys/src/lib/posix/ids.c
+++ b/sys/src/lib/posix/ids.c
@@ -143,6 +143,12 @@ POSIX_getpgrp(int *errnop)
 	return get_noteid(errnop, pid);
 }
 
+int
+POSIX_getpgid(int *errnop, int pid)
+{
+	return get_noteid(errnop, pid);
+}
+
 int
 POSIX_setpgid(int *errnop, int pid, int pgid)
 {