diff --git a/unix/mkerrors.sh b/unix/mkerrors.sh
index ca50e4e1..2ab44aa6 100755
--- a/unix/mkerrors.sh
+++ b/unix/mkerrors.sh
@@ -297,6 +297,10 @@ struct ltchars {
 #define SOL_NETLINK	270
 #endif
 
+#ifndef SOL_SMC
+#define SOL_SMC 286
+#endif
+
 #ifdef SOL_BLUETOOTH
 // SPARC includes this in /usr/include/sparc64-linux-gnu/bits/socket.h
 // but it is already in bluetooth_linux.go
diff --git a/unix/zerrors_linux.go b/unix/zerrors_linux.go
index b0d6c273..785d693e 100644
--- a/unix/zerrors_linux.go
+++ b/unix/zerrors_linux.go
@@ -2940,6 +2940,7 @@ const (
 	SOL_RAW                                     = 0xff
 	SOL_RDS                                     = 0x114
 	SOL_RXRPC                                   = 0x110
+	SOL_SMC                                     = 0x11e
 	SOL_TCP                                     = 0x6
 	SOL_TIPC                                    = 0x10f
 	SOL_TLS                                     = 0x11a