diff --git a/src/header/grp/mod.rs b/src/header/grp/mod.rs
index 20d5a91f29..1f5ef44a6f 100644
--- a/src/header/grp/mod.rs
+++ b/src/header/grp/mod.rs
@@ -18,12 +18,14 @@ use alloc::{
 };
 
 use crate::{
+    error::ResultExt,
     fs::File,
-    header::{errno, fcntl, limits, string::strlen, unistd},
-    io,
-    io::{BufReader, Lines, prelude::*},
-    platform,
-    platform::types::{c_char, c_int, c_void, gid_t, size_t},
+    header::{errno, fcntl, limits, string::strlen},
+    io::{self, BufReader, Lines, prelude::*},
+    platform::{
+        self, Pal, Sys,
+        types::{c_char, c_int, c_void, gid_t, size_t},
+    },
 };
 
 use super::{errno::*, string::strncmp};
@@ -544,5 +546,13 @@ pub unsafe extern "C" fn initgroups(user: *const c_char, gid: gid_t) -> c_int {
     if unsafe { getgrouplist(user, gid, groups.as_mut_ptr(), &raw mut count) < 0 } {
         return -1;
     }
-    unsafe { unistd::setgroups(count as size_t, groups.as_ptr()) }
+    unsafe { setgroups(count as size_t, groups.as_ptr()) }
+}
+
+/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man2/setgroups.2.html>.
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn setgroups(size: size_t, list: *const gid_t) -> c_int {
+    unsafe { Sys::setgroups(size, list) }
+        .map(|()| 0)
+        .or_minus_one_errno()
 }
diff --git a/src/header/unistd/mod.rs b/src/header/unistd/mod.rs
index fa30b644d0..d3bc890f48 100644
--- a/src/header/unistd/mod.rs
+++ b/src/header/unistd/mod.rs
@@ -899,16 +899,6 @@ pub extern "C" fn setgid(gid: gid_t) -> c_int {
         .or_minus_one_errno()
 }
 
-/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man2/setgroups.2.html>.
-///
-/// TODO: specified in `grp.h`?
-#[unsafe(no_mangle)]
-pub unsafe extern "C" fn setgroups(size: size_t, list: *const gid_t) -> c_int {
-    unsafe { Sys::setgroups(size, list) }
-        .map(|()| 0)
-        .or_minus_one_errno()
-}
-
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/setpgid.html>.
 #[unsafe(no_mangle)]
 pub extern "C" fn setpgid(pid: pid_t, pgid: pid_t) -> c_int {
diff --git a/src/platform/pal/mod.rs b/src/platform/pal/mod.rs
index 4c5be00036..3b8c119f85 100644
--- a/src/platform/pal/mod.rs
+++ b/src/platform/pal/mod.rs
@@ -349,7 +349,7 @@ pub trait Pal {
     /// Platform implementation of [`sched_yield()`](crate::header::sched::sched_yield) from [`sched.h`](crate::header::sched).
     fn sched_yield() -> Result<()>;
 
-    /// Platform implementation of [`setgroups()`](crate::header::unistd::setgroups) from [`unistd.h`](crate::header::unistd) (TODO: should be `grp.h`?).
+    /// Platform implementation of [`setgroups()`](crate::header::grp::setgroups) from [`grp.h`](crate::header::grp).
     unsafe fn setgroups(size: size_t, list: *const gid_t) -> Result<()>;
 
     /// Platform implementation of [`setpgid()`](crate::header::unistd::setpgid) from [`unistd.h`](crate::header::unistd).