diff --git a/man3/getgrnam.3 b/man3/getgrnam.3
index 87f61c260..1b13208ba 100644
--- a/man3/getgrnam.3
+++ b/man3/getgrnam.3
@@ -41,10 +41,13 @@ getgrnam, getgrnam_r, getgrgid, getgrgid_r \- get group file entry
 .BI "struct group *getgrnam(const char *" name );
 .BI "struct group *getgrgid(gid_t " gid );
 .PP
-.BI "int getgrnam_r(const char *" name ", struct group *" grp ,
-.BI "          char *" buf ", size_t " buflen ", struct group **" result );
-.BI "int getgrgid_r(gid_t " gid ", struct group *" grp ,
-.BI "          char *" buf ", size_t " buflen ", struct group **" result );
+.BI "int getgrnam_r(const char *restrict " name \
+", struct group *restrict " grp ,
+.BI "               char *restrict " buf ", size_t " buflen ,
+.BI "               struct group **restrict " result );
+.BI "int getgrgid_r(gid_t " gid ", struct group *restrict " grp ,
+.BI "               char *restrict " buf ", size_t " buflen ,
+.BI "               struct group **restrict " result );
 .fi
 .PP
 .RS -4