diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index 7cf8afbd950c..ddb71502921b 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -374,6 +374,7 @@ extern {
                     -> ::c_int;
     pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
     pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_settime(clk_id: clockid_t, tp: *const ::timespec) -> ::c_int;
 
     pub fn setutxdb(_type: ::c_uint, file: *mut ::c_char) -> ::c_int;
 
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 47132121c147..ba56d1e13e78 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -364,6 +364,7 @@ extern {
 
     pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
     pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_settime(clk_id: clockid_t, tp: *const ::timespec) -> ::c_int;
 
     pub fn posix_fallocate(fd: ::c_int, offset: ::off_t,
                            len: ::off_t) -> ::c_int;
diff --git a/src/unix/bsd/netbsdlike/mod.rs b/src/unix/bsd/netbsdlike/mod.rs
index 6604ec03b2cb..5fb527d44bf0 100644
--- a/src/unix/bsd/netbsdlike/mod.rs
+++ b/src/unix/bsd/netbsdlike/mod.rs
@@ -472,6 +472,8 @@ extern {
     pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
     #[cfg_attr(target_os = "netbsd", link_name = "__clock_gettime50")]
     pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
+    #[cfg_attr(target_os = "netbsd", link_name = "__clock_settime50")]
+    pub fn clock_settime(clk_id: clockid_t, tp: *const ::timespec) -> ::c_int;
     pub fn __errno() -> *mut ::c_int;
     pub fn shm_open(name: *const ::c_char, oflag: ::c_int, mode: ::mode_t)
                     -> ::c_int;
diff --git a/src/unix/haiku/mod.rs b/src/unix/haiku/mod.rs
index 2cd43f78ae39..ab53e6c788c6 100644
--- a/src/unix/haiku/mod.rs
+++ b/src/unix/haiku/mod.rs
@@ -712,6 +712,7 @@ f! {
 
 extern {
     pub fn clock_gettime(clk_id: ::c_int, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_settime(clk_id: ::c_int, tp: *const ::timespec) -> ::c_int;
     pub fn pthread_attr_getguardsize(attr: *const ::pthread_attr_t,
                                      guardsize: *mut ::size_t) -> ::c_int;
     pub fn pthread_attr_getstack(attr: *const ::pthread_attr_t,
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index eee6ca64c2ff..173a9610ec37 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -725,6 +725,7 @@ extern {
                            flags: ::c_int,
                            rqtp: *const ::timespec,
                            rmtp:  *mut ::timespec) -> ::c_int;
+    pub fn clock_settime(clk_id: clockid_t, tp: *const ::timespec) -> ::c_int;
     pub fn prctl(option: ::c_int, ...) -> ::c_int;
     pub fn pthread_getattr_np(native: ::pthread_t,
                               attr: *mut ::pthread_attr_t) -> ::c_int;
diff --git a/src/unix/solaris/mod.rs b/src/unix/solaris/mod.rs
index 0fc96e09ef3c..96ad0b118657 100644
--- a/src/unix/solaris/mod.rs
+++ b/src/unix/solaris/mod.rs
@@ -979,6 +979,7 @@ extern {
                            flags: ::c_int,
                            rqtp: *const ::timespec,
                            rmtp:  *mut ::timespec) -> ::c_int;
+    pub fn clock_settime(clk_id: clockid_t, tp: *const ::timespec) -> ::c_int;
     pub fn getnameinfo(sa: *const ::sockaddr,
                        salen: ::socklen_t,
                        host: *mut ::c_char,