diff --git a/libc-test/semver/unix.txt b/libc-test/semver/unix.txt
index d540c29cc2f1b..7fd544874b601 100644
--- a/libc-test/semver/unix.txt
+++ b/libc-test/semver/unix.txt
@@ -594,6 +594,7 @@ gmtime_r
 grantpt
 group
 hostent
+hstrerror
 if_indextoname
 if_nametoindex
 in6_addr
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index f91ae616702ec..21f903b65902d 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -1171,6 +1171,7 @@ extern "C" {
     )))]
     #[cfg_attr(target_os = "espidf", link_name = "lwip_freeaddrinfo")]
     pub fn freeaddrinfo(res: *mut addrinfo);
+    pub fn hstrerror(errcode: ::c_int) -> *const ::c_char;
     pub fn gai_strerror(errcode: ::c_int) -> *const ::c_char;
     #[cfg_attr(
         any(