diff --git a/libc-test/semver/unix.txt b/libc-test/semver/unix.txt
index 03248dfec58c7..bb8e319def299 100644
--- a/libc-test/semver/unix.txt
+++ b/libc-test/semver/unix.txt
@@ -152,6 +152,8 @@ IF_NAMESIZE
 IGNBRK
 IGNCR
 IGNPAR
+IN6ADDR_ANY_INIT
+IN6ADDR_LOOPBACK_INIT
 INADDR_ANY
 INADDR_BROADCAST
 INADDR_LOOPBACK
@@ -586,6 +588,8 @@ hstrerror
 if_indextoname
 if_nametoindex
 in6_addr
+in6addr_any
+in6addr_loopback
 in_addr
 in_addr_t
 in_port_t
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 8b3d988ae38ae..9b2bbe4bae2b9 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -305,6 +305,17 @@ pub const INADDR_ANY: in_addr_t = 0;
 pub const INADDR_BROADCAST: in_addr_t = 4294967295;
 pub const INADDR_NONE: in_addr_t = 4294967295;
 
+pub const IN6ADDR_LOOPBACK_INIT: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
+    #[cfg(not(libc_align))]
+    __align: [u32; 0],
+};
+pub const IN6ADDR_ANY_INIT: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+    #[cfg(not(libc_align))]
+    __align: [u32; 0],
+};
+
 pub const ARPOP_REQUEST: u16 = 1;
 pub const ARPOP_REPLY: u16 = 2;
 
@@ -313,6 +324,11 @@ pub const ATF_PERM: ::c_int = 0x04;
 pub const ATF_PUBL: ::c_int = 0x08;
 pub const ATF_USETRAILERS: ::c_int = 0x10;
 
+extern "C" {
+    pub static in6addr_loopback: in6_addr;
+    pub static in6addr_any: in6_addr;
+}
+
 cfg_if! {
     if #[cfg(any(target_os = "l4re", target_os = "espidf"))] {
         // required libraries for L4Re and the ESP-IDF framework are linked externally, ATM