diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
index e038aab1e..ddabefd16 100644
--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -374,7 +374,7 @@ POSIX.1-2001 and later.
 .BR getegid (2),
 .BR getgroups (2),
 .BR getresgid (2),
-.BR getgrnam (2),
+.BR getgrnam (3),
 .BR credentials (7)
 .RE
 .\"------------------------------------- id_t -------------------------/
@@ -675,7 +675,7 @@ C11 and later; POSIX.1-2001 and later.
 .IR "See also" :
 .BR setlocale (3),
 .BR localeconv (3),
-.BR charsets (5),
+.BR charsets (7),
 .BR locale (7)
 .RE
 .\"------------------------------------- ldiv_t -----------------------/
@@ -1534,7 +1534,7 @@ POSIX.1-2001 and later.
 .BR getuid (2),
 .BR geteuid (2),
 .BR getresuid (2),
-.BR getpwnam (2),
+.BR getpwnam (3),
 .BR credentials (7)
 .RE
 .\"------------------------------------- uintmax_t --------------------/