diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
index b026541b0..59c64fb89 100644
--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -158,10 +158,10 @@ or
 A type used to hold a general identifier.
 According to POSIX,
 this shall be an integer type that can be used to contain a
-.IR pid_ t ,
-.IR uid_ t ,
+.IR pid_t ,
+.IR uid_t ,
 or
-.IR gid_ t .
+.IR gid_t .
 .IP
 Conforming to: POSIX.1-2001 and later.
 .IP