diff --git a/session/session.go b/session/session.go
index d1666be45063f..76fac6d932b61 100644
--- a/session/session.go
+++ b/session/session.go
@@ -2506,6 +2506,7 @@ var builtinGlobalVariable = []string{
 	variable.TiDBOptBCJ,
 	variable.TiDBBCJThresholdSize,
 	variable.TiDBBCJThresholdCount,
+	variable.TiDBOptCartesianBCJ,
 	variable.TiDBRowFormatVersion,
 	variable.TiDBEnableStmtSummary,
 	variable.TiDBStmtSummaryInternalQuery,
diff --git a/sessionctx/variable/session.go b/sessionctx/variable/session.go
index 591ae934ba3dc..137a50891981d 100644
--- a/sessionctx/variable/session.go
+++ b/sessionctx/variable/session.go
@@ -1449,6 +1449,8 @@ func (s *SessionVars) SetSystemVar(name string, val string) error {
 		s.BroadcastJoinThresholdSize = tidbOptInt64(val, DefBroadcastJoinThresholdSize)
 	case TiDBBCJThresholdCount:
 		s.BroadcastJoinThresholdCount = tidbOptInt64(val, DefBroadcastJoinThresholdCount)
+	case TiDBOptCartesianBCJ:
+		s.AllowCartesianBCJ = int(tidbOptInt64(val, DefOptCartesianBCJ))
 	case TiDBOptDistinctAggPushDown:
 		s.AllowDistinctAggPushDown = TiDBOptOn(val)
 	case TiDBOptWriteRowID: