diff --git a/lib/libsysdecode/mktables b/lib/libsysdecode/mktables
index d61ae02205fe..a0ff8ee8516c 100644
--- a/lib/libsysdecode/mktables
+++ b/lib/libsysdecode/mktables
@@ -137,7 +137,7 @@ gen_table "sigtrapcode"     "TRAP_[A-Z]+[[:space:]]+[0-9]+"                "sys/
 gen_table "sockdomain"      "PF_[[:alnum:]]+[[:space:]]+"                  "sys/socket.h"
 gen_table "sockfamily"      "AF_[[:alnum:]]+[[:space:]]+"                  "sys/socket.h"
 gen_table "sockipproto"     "IPPROTO_[[:alnum:]]+[[:space:]]+"             "netinet/in.h"
-gen_table "sockopt"         "SO_[A-Z]+[[:space:]]+0x[0-9]+"                "sys/socket.h"
+gen_table "sockopt"         "SO_[A-Z_]+[[:space:]]+0x[0-9]+"               "sys/socket.h"
 gen_table "sockoptip"       "(IP_[[:alnum:]_]+|MCAST_[[:alnum:]_]+_GROUP)[[:space:]]+" "netinet/in.h" "IP_DEFAULT|IP_MIN|IP_MAX|IP_PORTRANGE"
 gen_table "sockoptipv6"     "IPV6_[[:alnum:]_]+[[:space:]]+[0-9]+"         "netinet6/in6.h"     "IPV6_ADDR_|IPV6_TAG_DIRECT|IPV6_OPTIONS|IPV6_RECVOPTS|IPV6_RECVRETOPTS|IPV6_RECVDSTADDR|IPV6_RETOPTS|IPV6_2292|IPV6_RECVRTHDRDSTOPTS|IPV6_REACHCONF|IPV6_PKTOPTIONS"
 gen_table "sockoptsctp"     "SCTP_[[:alnum:]_]+[[:space:]]+[0-9]+"         "netinet/sctp.h"