diff --git a/src/header/limits/mod.rs b/src/header/limits/mod.rs
index 40a8453a1d..45c37f06ca 100644
--- a/src/header/limits/mod.rs
+++ b/src/header/limits/mod.rs
@@ -7,7 +7,6 @@ use crate::platform::types::{
     c_ushort, ssize_t,
 };
 
-pub const HOST_NAME_MAX: usize = 64;
 pub const NAME_MAX: usize = 255;
 pub const PASS_MAX: usize = 128;
 pub const PATH_MAX: usize = 4096;
@@ -115,6 +114,16 @@ pub const COLL_WEIGHTS_MAX: c_long = _POSIX2_COLL_WEIGHTS_MAX;
 pub const EXPR_NEST_MAX: c_long = _POSIX2_EXPR_NEST_MAX;
 pub const LINE_MAX: c_long = _POSIX2_LINE_MAX;
 pub const RE_DUP_MAX: c_long = _POSIX2_RE_DUP_MAX;
+pub const HOST_NAME_MAX: c_long = _POSIX_HOST_NAME_MAX;
+pub const LOGIN_NAME_MAX: c_long = 255;
+pub const GETENTROPY_MAX: c_long = 256;
+pub const LINK_MAX: c_long = 127;
+pub const PIPE_BUF: c_long = 4096;
+pub const FILESIZEBITS: c_long = 64;
+pub const MAX_CANON: c_long = _POSIX_MAX_CANON;
+pub const MAX_INPUT: c_long = _POSIX_MAX_INPUT;
+pub const SYMLINK_MAX: c_long = _POSIX_SYMLINK_MAX;
+pub const POSIX_ALLOC_SIZE_MIN: c_long = 4096;
 
 pub const PTHREAD_DESTRUCTOR_ITERATIONS: c_long = _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
 // TODO: What should this limit be? Both glibc and musl have it as 1024
diff --git a/src/header/unistd/pathconf.rs b/src/header/unistd/pathconf.rs
index 276dbdbcc1..74a90cead7 100644
--- a/src/header/unistd/pathconf.rs
+++ b/src/header/unistd/pathconf.rs
@@ -1,5 +1,12 @@
 use crate::{
-    header::{errno, termios::_POSIX_VDISABLE},
+    header::{
+        errno,
+        limits::{
+            FILESIZEBITS, LINK_MAX, MAX_CANON, MAX_INPUT, NAME_MAX, PATH_MAX, PIPE_BUF,
+            POSIX_ALLOC_SIZE_MIN, SYMLINK_MAX,
+        },
+        termios::_POSIX_VDISABLE,
+    },
     platform::{
         self,
         types::{c_char, c_int, c_long},
@@ -32,12 +39,12 @@ pub const _PC_2_SYMLINKS: c_int = 20;
 fn pc(name: c_int) -> c_long {
     // Settings from musl, some adjusted
     match name {
-        _PC_LINK_MAX => 127,
-        _PC_MAX_CANON => 255,
-        _PC_MAX_INPUT => 255,
-        _PC_NAME_MAX => 255,
-        _PC_PATH_MAX => 4096,
-        _PC_PIPE_BUF => 4096,
+        _PC_LINK_MAX => LINK_MAX.try_into().unwrap_or(-1),
+        _PC_MAX_CANON => MAX_CANON.try_into().unwrap_or(-1),
+        _PC_MAX_INPUT => MAX_INPUT.try_into().unwrap_or(-1),
+        _PC_NAME_MAX => NAME_MAX.try_into().unwrap_or(-1),
+        _PC_PATH_MAX => PATH_MAX.try_into().unwrap_or(-1),
+        _PC_PIPE_BUF => PIPE_BUF.try_into().unwrap_or(-1),
         _PC_CHOWN_RESTRICTED => 1,
         _PC_NO_TRUNC => 1,
         _PC_VDISABLE => _POSIX_VDISABLE.into(),
@@ -45,13 +52,13 @@ fn pc(name: c_int) -> c_long {
         _PC_ASYNC_IO => -1,
         _PC_PRIO_IO => -1,
         _PC_SOCK_MAXBUF => -1,
-        _PC_FILESIZEBITS => 64,
+        _PC_FILESIZEBITS => FILESIZEBITS.into(),
         _PC_REC_INCR_XFER_SIZE => -1,
         _PC_REC_MAX_XFER_SIZE => -1,
         _PC_REC_MIN_XFER_SIZE => 4096,
         _PC_REC_XFER_ALIGN => 4096,
-        _PC_ALLOC_SIZE_MIN => 4096,
-        _PC_SYMLINK_MAX => -1,
+        _PC_ALLOC_SIZE_MIN => POSIX_ALLOC_SIZE_MIN.try_into().unwrap_or(-1),
+        _PC_SYMLINK_MAX => SYMLINK_MAX.try_into().unwrap_or(-1),
         _PC_2_SYMLINKS => 1,
         _ => {
             platform::ERRNO.set(errno::EINVAL);
diff --git a/src/header/unistd/sysconf/redox.rs b/src/header/unistd/sysconf/redox.rs
index 8e4a744ce8..97ee81aaf6 100644
--- a/src/header/unistd/sysconf/redox.rs
+++ b/src/header/unistd/sysconf/redox.rs
@@ -93,7 +93,7 @@ pub(super) fn sysconf_impl(name: c_int) -> c_long {
         _SC_TIMEOUTS => 202405,
         _SC_TIMERS => 202405,
         _SC_SYMLOOP_MAX => -1,
-        _SC_HOST_NAME_MAX => 64,
+        _SC_HOST_NAME_MAX => limits::HOST_NAME_MAX.try_into().unwrap_or(-1),
         _SC_NPROCESSORS_CONF => get_cpu_count().unwrap_or(None).unwrap_or(1),
         _SC_NPROCESSORS_ONLN => get_cpu_count().unwrap_or(None).unwrap_or(1),
         _SC_PHYS_PAGES => get_mem_stat().map(|s| s.f_blocks as c_long).unwrap_or(-1),