diff --git a/src/header/bits_sigset-t/cbindgen.toml b/src/header/bits_sigset-t/cbindgen.toml
new file mode 100644
index 0000000000..5cd5ba7970
--- /dev/null
+++ b/src/header/bits_sigset-t/cbindgen.toml
@@ -0,0 +1,18 @@
+# POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/signal.h.html
+#
+# This type is split out to prevent importing all of signal.h into other headers.
+#
+# POSIX headers that require sigset_t:
+# - poll.h
+# - signal.h (where it should be defined)
+# - sys/select.h
+sys_includes = []
+include_guard = "_RELIBC_BITS_SIGSET_T_H"
+language = "C"
+style = "type"
+no_includes = true
+cpp_compat = true
+[export]
+include = ["sigset_t"]
+[enum]
+prefix_with_name = true
diff --git a/src/header/bits_sigset-t/mod.rs b/src/header/bits_sigset-t/mod.rs
new file mode 100644
index 0000000000..fea419ee95
--- /dev/null
+++ b/src/header/bits_sigset-t/mod.rs
@@ -0,0 +1,4 @@
+use crate::platform::types::c_ulonglong;
+
+#[allow(non_camel_case_types)]
+pub type sigset_t = c_ulonglong;
diff --git a/src/header/mod.rs b/src/header/mod.rs
index 5afeb0c2d1..4bdb6b19e8 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -11,6 +11,8 @@ pub mod bits_locale_t;
 pub mod bits_pthread;
 #[path = "bits_safamily-t/mod.rs"]
 pub mod bits_safamily_t;
+#[path = "bits_sigset-t/mod.rs"]
+pub mod bits_sigset_t;
 #[path = "bits_socklen-t/mod.rs"]
 pub mod bits_socklen_t;
 pub mod bits_timespec;
diff --git a/src/header/poll/mod.rs b/src/header/poll/mod.rs
index 024a8d600e..8f42cf8366 100644
--- a/src/header/poll/mod.rs
+++ b/src/header/poll/mod.rs
@@ -7,9 +7,9 @@ use core::{mem, ptr, slice};
 use crate::{
     fs::File,
     header::{
+        bits_sigset_t::sigset_t,
         bits_timespec::timespec,
         errno::EBADF,
-        signal::sigset_t,
         sys_epoll::{
             EPOLL_CLOEXEC, EPOLL_CTL_ADD, EPOLLERR, EPOLLHUP, EPOLLIN, EPOLLNVAL, EPOLLOUT,
             EPOLLPRI, EPOLLRDBAND, EPOLLRDNORM, EPOLLWRBAND, EPOLLWRNORM, epoll_create1, epoll_ctl,
diff --git a/src/header/pty/mod.rs b/src/header/pty/mod.rs
index 19b2442221..995aef8aec 100644
--- a/src/header/pty/mod.rs
+++ b/src/header/pty/mod.rs
@@ -5,7 +5,9 @@
 use core::{mem, ptr, slice};
 
 use crate::{
-    header::{fcntl, limits, pthread, signal, sys_ioctl, sys_wait, termios, unistd, utmp},
+    header::{
+        bits_sigset_t, fcntl, limits, pthread, signal, sys_ioctl, sys_wait, termios, unistd, utmp,
+    },
     platform::{
         self,
         types::{c_char, c_int, c_void},
@@ -69,8 +71,8 @@ pub unsafe extern "C" fn forkpty(
     let mut p: [c_int; 2] = [0; 2];
     let mut cs = 0;
     let mut pid = -1;
-    let mut set = signal::sigset_t::default();
-    let mut oldset = signal::sigset_t::default();
+    let mut set = bits_sigset_t::sigset_t::default();
+    let mut oldset = bits_sigset_t::sigset_t::default();
 
     if unsafe { openpty(&raw mut m, &raw mut s, name, tio, ws) } < 0 {
         return -1;
diff --git a/src/header/signal/cbindgen.toml b/src/header/signal/cbindgen.toml
index e2e7cd120e..7363f32543 100644
--- a/src/header/signal/cbindgen.toml
+++ b/src/header/signal/cbindgen.toml
@@ -9,6 +9,7 @@
 sys_includes = ["sys/types.h"]
 include_guard = "_RELIBC_SIGNAL_H"
 after_includes = """
+#include <bits/sigset-t.h> // for sigset_t
 #include <bits/timespec.h> // for timespec from time.h
 
 #define SIG_DFL ((void (*)(int))0)
@@ -17,7 +18,6 @@ after_includes = """
 #define SIG_HOLD ((void (*)(int))2)
 
 typedef struct siginfo siginfo_t;
-typedef unsigned long long sigset_t;
 typedef struct ucontext ucontext_t;
 typedef struct mcontext mcontext_t;
 typedef long sig_atomic_t;
diff --git a/src/header/signal/mod.rs b/src/header/signal/mod.rs
index a1913a0c09..f0495739ed 100644
--- a/src/header/signal/mod.rs
+++ b/src/header/signal/mod.rs
@@ -8,7 +8,7 @@ use cbitset::BitSet;
 
 use crate::{
     error::{Errno, ResultExt},
-    header::{bits_timespec::timespec, errno, setjmp},
+    header::{bits_sigset_t::sigset_t, bits_timespec::timespec, errno, setjmp},
     platform::{
         self, ERRNO, Pal, PalSignal, Sys,
         types::{
@@ -102,8 +102,6 @@ pub union sigval {
     pub sival_ptr: *mut c_void,
 }
 
-/// cbindgen:ignore
-pub type sigset_t = c_ulonglong;
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/signal.h.html>.
 /// cbindgen:ignore
 pub type siginfo_t = siginfo;
diff --git a/src/header/sys_epoll/mod.rs b/src/header/sys_epoll/mod.rs
index 7cad658c7a..715d7b9d63 100644
--- a/src/header/sys_epoll/mod.rs
+++ b/src/header/sys_epoll/mod.rs
@@ -6,7 +6,7 @@ use core::ptr;
 
 use crate::{
     error::ResultExt,
-    header::signal::sigset_t,
+    header::bits_sigset_t::sigset_t,
     platform::{
         PalEpoll, Sys,
         types::{c_int, c_void},
diff --git a/src/header/unistd/mod.rs b/src/header/unistd/mod.rs
index 573d69ad93..f80965dbe9 100644
--- a/src/header/unistd/mod.rs
+++ b/src/header/unistd/mod.rs
@@ -15,10 +15,12 @@ use crate::{
     c_str::CStr,
     error::{Errno, ResultExt},
     header::{
+        bits_sigset_t::sigset_t,
         bits_timespec::timespec,
         crypt::{crypt_data, crypt_r},
         errno::{self, ENAMETOOLONG},
         fcntl, limits,
+        signal::{sigprocmask, sigsuspend},
         stdlib::getenv,
         sys_ioctl, sys_resource,
         sys_select::timeval,
@@ -50,8 +52,6 @@ use super::{
     stdio::snprintf,
 };
 
-use crate::header::signal::{sigprocmask, sigset_t, sigsuspend};
-
 mod brk;
 mod getopt;
 mod getpass;
diff --git a/src/platform/linux/epoll.rs b/src/platform/linux/epoll.rs
index a42eaeaf96..ce5b9be3da 100644
--- a/src/platform/linux/epoll.rs
+++ b/src/platform/linux/epoll.rs
@@ -3,8 +3,11 @@ use core::mem;
 use super::{Sys, e_raw};
 use crate::{
     error::Result,
-    header::{signal::sigset_t, sys_epoll::epoll_event},
-    platform::{PalEpoll, types::*},
+    header::{bits_sigset_t::sigset_t, sys_epoll::epoll_event},
+    platform::{
+        PalEpoll,
+        types::{c_int, size_t},
+    },
 };
 
 impl PalEpoll for Sys {
diff --git a/src/platform/linux/signal.rs b/src/platform/linux/signal.rs
index 3f511b6323..ef748a36e7 100644
--- a/src/platform/linux/signal.rs
+++ b/src/platform/linux/signal.rs
@@ -15,10 +15,11 @@ use crate::header::sys_time::itimerval;
 use crate::{
     error::{Errno, Result},
     header::{
+        bits_sigset_t::sigset_t,
         bits_timespec::timespec,
         signal::{
-            SA_RESTORER, SI_QUEUE, SIGALRM, SIGEV_SIGNAL, sigaction, sigevent, siginfo_t, sigset_t,
-            sigval, stack_t,
+            SA_RESTORER, SI_QUEUE, SIGALRM, SIGEV_SIGNAL, sigaction, sigevent, siginfo_t, sigval,
+            stack_t,
         },
         time,
     },
diff --git a/src/platform/pal/epoll.rs b/src/platform/pal/epoll.rs
index c7d00f21b8..0d417d7df7 100644
--- a/src/platform/pal/epoll.rs
+++ b/src/platform/pal/epoll.rs
@@ -1,6 +1,6 @@
 use crate::{
     error::Result,
-    header::{signal::sigset_t, sys_epoll::epoll_event},
+    header::{bits_sigset_t::sigset_t, sys_epoll::epoll_event},
     platform::{Pal, types::c_int},
 };
 
diff --git a/src/platform/pal/signal.rs b/src/platform/pal/signal.rs
index 94b3a3ae58..1eeba0fa1e 100644
--- a/src/platform/pal/signal.rs
+++ b/src/platform/pal/signal.rs
@@ -7,8 +7,9 @@ use crate::header::sys_time::itimerval;
 use crate::{
     error::{Errno, Result},
     header::{
+        bits_sigset_t::sigset_t,
         bits_timespec::timespec,
-        signal::{sigaction, siginfo_t, sigset_t, sigval, stack_t},
+        signal::{sigaction, siginfo_t, sigval, stack_t},
     },
 };
 
diff --git a/src/platform/redox/epoll.rs b/src/platform/redox/epoll.rs
index b73660d697..060b645767 100644
--- a/src/platform/redox/epoll.rs
+++ b/src/platform/redox/epoll.rs
@@ -6,7 +6,7 @@ use super::{
 use crate::{
     error::Errno,
     fs::File,
-    header::{errno::*, fcntl::*, signal::sigset_t, sys_epoll::*},
+    header::{bits_sigset_t::sigset_t, errno::*, fcntl::*, sys_epoll::*},
     io::prelude::*,
 };
 use core::{mem, slice};
diff --git a/src/platform/redox/event.rs b/src/platform/redox/event.rs
index 5d77de41cf..b02f641ce9 100644
--- a/src/platform/redox/event.rs
+++ b/src/platform/redox/event.rs
@@ -1,9 +1,9 @@
 use core::mem::size_of;
 
 use crate::header::{
+    bits_sigset_t::sigset_t,
     bits_timespec::timespec,
     fcntl::{O_CLOEXEC, O_CREAT, O_RDWR},
-    signal::sigset_t,
 };
 
 use super::libredox::RawResult;
diff --git a/src/platform/redox/signal.rs b/src/platform/redox/signal.rs
index 7987528708..faa03ea09e 100644
--- a/src/platform/redox/signal.rs
+++ b/src/platform/redox/signal.rs
@@ -7,12 +7,12 @@ use crate::header::sys_time::{ITIMER_REAL, itimerval};
 use crate::{
     error::{Errno, Result},
     header::{
+        bits_sigset_t::sigset_t,
         bits_timespec::timespec,
         errno::{EINVAL, ENOSYS},
         signal::{
             SIG_BLOCK, SIG_DFL, SIG_IGN, SIG_SETMASK, SIG_UNBLOCK, SIGALRM, SIGEV_SIGNAL,
-            SS_DISABLE, SS_ONSTACK, sigaction, sigevent, siginfo_t, sigset_t, sigval, stack_t,
-            ucontext_t,
+            SS_DISABLE, SS_ONSTACK, sigaction, sigevent, siginfo_t, sigval, stack_t, ucontext_t,
         },
         time::{itimerspec, timer_internal_t},
     },