diff --git a/include/unistd.h b/include/unistd.h
index 2791c3de82c2b10879ecd1736e6cee790e743e8f..64a6b4615ed9b498a010fe2f560334b90f5372d4 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -168,7 +168,7 @@ int getdtablesize(void);
 int sethostname(const char *, size_t);
 int getdomainname(char *, size_t);
 int setdomainname(const char *, size_t);
-int setgroups(size_t, const gid_t []);
+int setgroups(size_t, const gid_t *);
 char *getpass(const char *);
 int daemon(int, int);
 void setusershell(void);