diff --git a/headers/posix/unistd.h b/headers/posix/unistd.h
index 22986b257f..9177571aec 100644
--- a/headers/posix/unistd.h
+++ b/headers/posix/unistd.h
@@ -155,6 +155,8 @@ extern uid_t	getuid(void);
 
 extern int		setgid(gid_t gid);
 extern int		setuid(uid_t uid);
+extern int		setegid(gid_t gid);
+extern int		seteuid(uid_t uid);
 
 extern char		*getlogin(void);
 extern int		getlogin_r(char *name, size_t nameSize);
diff --git a/src/system/libroot/posix/unistd/usergroup.c b/src/system/libroot/posix/unistd/usergroup.c
index ae0fd98231..5bac0f4a28 100644
--- a/src/system/libroot/posix/unistd/usergroup.c
+++ b/src/system/libroot/posix/unistd/usergroup.c
@@ -73,6 +73,20 @@ setuid(uid_t uid)
 }
 
 
+int
+setegid(gid_t gid)
+{
+	return EPERM;
+}
+
+
+int
+seteuid(uid_t uid)
+{
+	return EPERM;
+}
+
+
 char *
 getlogin(void)
 {