diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index eb851abf42f65b08172e0cd043493c554da2a6e2..9c2cafcbc09cb7835285110d1661d69b8096428e 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -538,6 +538,7 @@ extern "C" {
     pub fn strerror(n: c_int) -> *mut c_char;
     pub fn strtok(s: *mut c_char, t: *const c_char) -> *mut c_char;
     pub fn strxfrm(s: *mut c_char, ct: *const c_char, n: size_t) -> size_t;
+    pub fn strsignal(sig: c_int) -> *mut c_char;
     pub fn wcslen(buf: *const wchar_t) -> size_t;
     pub fn wcstombs(
         dest: *mut c_char,