diff --git a/libc-test/build.rs b/libc-test/build.rs
index 3e443bb86e932..27b2962b29124 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -177,6 +177,7 @@ fn test_apple(target: &str) {
 
     headers! { cfg:
         "aio.h",
+        "arpa/inet.h",
         "CommonCrypto/CommonCrypto.h",
         "CommonCrypto/CommonRandom.h",
         "copyfile.h",
@@ -192,6 +193,14 @@ fn test_apple(target: &str) {
         "grp.h",
         "iconv.h",
         "ifaddrs.h",
+
+        "sys/types.h",
+     "sys/socket.h",
+     "sys/netinet/in.h",
+     "sys/arpa/inet.h",
+     "endian.h",
+     "libkern/OSByteOrder.h",
+     "sys/endian.h",
         "langinfo.h",
         "libgen.h",
         "libproc.h",
diff --git a/libc-test/semver/unix.txt b/libc-test/semver/unix.txt
index 5e84434b46bf4..d09dd1d83f1b8 100644
--- a/libc-test/semver/unix.txt
+++ b/libc-test/semver/unix.txt
@@ -583,6 +583,8 @@ grantpt
 group
 hostent
 hstrerror
+htonl
+htons
 if_indextoname
 if_nametoindex
 in6_addr
@@ -651,6 +653,8 @@ munmap
 nanosleep
 nfds_t
 nlink_t
+ntohl
+ntohs
 off_t
 open
 opendir
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 51984bc2c42c2..ef1086bd562e2 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -672,6 +672,10 @@ extern "C" {
     ) -> ::ssize_t;
     #[cfg_attr(target_os = "espidf", link_name = "lwip_shutdown")]
     pub fn shutdown(socket: ::c_int, how: ::c_int) -> ::c_int;
+    pub fn htonl(hostlong: u32) -> u32;
+    pub fn htons(hostshort: u16) -> u16;
+    pub fn ntohl(netlong: u32) -> u32;
+    pub fn ntohs(netshort: u16) -> u16;
 
     #[cfg_attr(
         all(target_os = "macos", target_arch = "x86"),