diff --git a/lib/libsysdecode/mktables b/lib/libsysdecode/mktables
--- a/lib/libsysdecode/mktables
+++ b/lib/libsysdecode/mktables
@@ -120,7 +120,7 @@
 gen_table "ptraceop"        "PT_[[:alnum:]_]+[[:space:]]+[0-9]+"           "sys/ptrace.h"
 gen_table "quotactlcmds"    "Q_[A-Z]+[[:space:]]+0x[0-9]+"                 "ufs/ufs/quota.h"
 gen_table "rebootopt"       "RB_[A-Z]+[[:space:]]+0x[0-9]+"                "sys/reboot.h"
-gen_table "rforkflags"      "RF[A-Z]+[[:space:]]+\([0-9]+<<[0-9]+\)"       "sys/unistd.h"
+gen_table "rforkflags"      "RF[A-Z]+[[:space:]]+\([0-9]+[uU]?<<[0-9]+\)"       "sys/unistd.h"	"RFPPWAIT"
 gen_table "rlimit"          "RLIMIT_[A-Z]+[[:space:]]+[0-9]+"              "sys/resource.h"
 gen_table "rusage"          "RUSAGE_[A-Z]+[[:space:]]+[-0-9]+"             "sys/resource.h"
 gen_table "schedpolicy"     "SCHED_[A-Z]+[[:space:]]+[0-9]+"               "sys/sched.h"