diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index bb07cc48..f2158360 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -1575,6 +1575,8 @@ pub const IP_DROP_MEMBERSHIP: ::c_int = 13;
 pub const IP_PKTINFO: ::c_int = 26;
 pub const IPV6_JOIN_GROUP: ::c_int = 12;
 pub const IPV6_LEAVE_GROUP: ::c_int = 13;
+pub const IPV6_RECVTCLASS: ::c_int = 35;
+pub const IPV6_TCLASS: ::c_int = 36;
 pub const IPV6_PKTINFO: ::c_int = 46;
 pub const IPV6_RECVPKTINFO: ::c_int = 61;
 
diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index cb3dba40..1dc559af 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -668,6 +668,8 @@ pub const IPV6_JOIN_GROUP: ::c_int = 12;
 pub const IPV6_LEAVE_GROUP: ::c_int = 13;
 pub const IPV6_RECVPKTINFO: ::c_int = 36;
 pub const IPV6_PKTINFO: ::c_int = 46;
+pub const IPV6_RECVTCLASS: ::c_int = 57;
+pub const IPV6_TCLASS: ::c_int = 61;
 
 pub const TCP_NOPUSH:    ::c_int = 4;
 pub const TCP_NOOPT:     ::c_int = 8;
diff --git a/src/unix/bsd/netbsdlike/mod.rs b/src/unix/bsd/netbsdlike/mod.rs
index bfd541d8..abd014c4 100644
--- a/src/unix/bsd/netbsdlike/mod.rs
+++ b/src/unix/bsd/netbsdlike/mod.rs
@@ -430,6 +430,8 @@ pub const IP_ADD_MEMBERSHIP: ::c_int = 12;
 pub const IP_DROP_MEMBERSHIP: ::c_int = 13;
 pub const IPV6_RECVPKTINFO: ::c_int = 36;
 pub const IPV6_PKTINFO: ::c_int = 46;
+pub const IPV6_RECVTCLASS: ::c_int = 57;
+pub const IPV6_TCLASS: ::c_int = 61;
 
 pub const SOL_SOCKET: ::c_int = 0xffff;
 pub const SO_DEBUG: ::c_int = 0x01;
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index 143d7ede..52375fc9 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -640,6 +640,8 @@ pub const IPV6_DROP_MEMBERSHIP: ::c_int = 21;
 pub const IPV6_V6ONLY: ::c_int = 26;
 pub const IPV6_RECVPKTINFO: ::c_int = 49;
 pub const IPV6_PKTINFO: ::c_int = 50;
+pub const IPV6_RECVTCLASS: ::c_int = 66;
+pub const IPV6_TCLASS: ::c_int = 67;
 
 pub const TCP_NODELAY: ::c_int = 1;
 pub const TCP_MAXSEG: ::c_int = 2;