diff --git a/src/header/pty/linux.rs b/src/header/pty/linux.rs
index bda6ded3b2..faad407d87 100644
--- a/src/header/pty/linux.rs
+++ b/src/header/pty/linux.rs
@@ -1,7 +1,7 @@
 use crate::{
     header::{fcntl, sys_ioctl, unistd},
     io::{Cursor, Write},
-    platform::types::*,
+    platform::types::{c_char, c_int, c_void},
 };
 
 pub(super) unsafe fn openpty(name: &mut [u8]) -> Result<(c_int, c_int), ()> {
diff --git a/src/header/pty/mod.rs b/src/header/pty/mod.rs
index 37e0e5d9b7..126be6c957 100644
--- a/src/header/pty/mod.rs
+++ b/src/header/pty/mod.rs
@@ -6,7 +6,10 @@ use core::{mem, ptr, slice};
 
 use crate::{
     header::{fcntl, limits, pthread, signal, sys_ioctl, sys_wait, termios, unistd, utmp},
-    platform::{self, types::*},
+    platform::{
+        self,
+        types::{c_char, c_int, c_void},
+    },
 };
 
 #[cfg(target_os = "linux")]
diff --git a/src/header/pty/redox.rs b/src/header/pty/redox.rs
index f9c0f1f756..34d5934ba9 100644
--- a/src/header/pty/redox.rs
+++ b/src/header/pty/redox.rs
@@ -2,7 +2,7 @@ use crate::{
     Pal, Sys,
     error::ResultExt,
     header::{fcntl, unistd},
-    platform::types::*,
+    platform::types::{c_char, c_int, ssize_t},
 };
 
 pub(super) unsafe fn openpty(name: &mut [u8]) -> Result<(c_int, c_int), ()> {
diff --git a/src/header/pwd/linux.rs b/src/header/pwd/linux.rs
index 0d74036685..38a6711787 100644
--- a/src/header/pwd/linux.rs
+++ b/src/header/pwd/linux.rs
@@ -1,5 +1,5 @@
 use super::{parsed, passwd};
-use crate::platform::types::*;
+use crate::platform::types::c_char;
 
 pub fn split(line: &mut [u8]) -> Option<passwd> {
     let mut parts = line.split_mut(|&c| c == b'\0');
diff --git a/src/header/pwd/mod.rs b/src/header/pwd/mod.rs
index 478afcc77b..20322d6178 100644
--- a/src/header/pwd/mod.rs
+++ b/src/header/pwd/mod.rs
@@ -13,7 +13,10 @@ use crate::{
     fs::File,
     header::{errno, fcntl, string::strcmp},
     io::{BufReader, SeekFrom, prelude::*},
-    platform::{self, types::*},
+    platform::{
+        self,
+        types::{c_char, c_int, gid_t, size_t, uid_t},
+    },
     raw_cell::RawCell,
 };
 
@@ -128,6 +131,9 @@ where
     string.parse().ok()
 }
 
+/// See <https://www.man7.org/linux/man-pages/man3/getpwent_r.3.html>.
+///
+/// Non-POSIX
 fn getpwent_r(
     reader: &mut BufReader<File>,
     destination: Option<DestBuffer>,
diff --git a/src/header/pwd/redox.rs b/src/header/pwd/redox.rs
index 88b218ead9..7bb5619861 100644
--- a/src/header/pwd/redox.rs
+++ b/src/header/pwd/redox.rs
@@ -1,5 +1,5 @@
 use super::{parsed, passwd};
-use crate::platform::types::*;
+use crate::platform::types::c_char;
 
 pub fn split(line: &mut [u8]) -> Option<passwd> {
     let mut parts = line.split_mut(|&c| c == b'\0');