diff --git a/go/vt/sysvars/sysvars.go b/go/vt/sysvars/sysvars.go
index 297ed956bf8..1fc69da962c 100644
--- a/go/vt/sysvars/sysvars.go
+++ b/go/vt/sysvars/sysvars.go
@@ -226,7 +226,7 @@ var (
 		{Name: "tmp_table_size", SupportSetVar: true},
 		{Name: "transaction_isolation", Case: SCUpper},
 		{Name: "transaction_prealloc_size"},
-		{Name: "tx_isolation", Case: SCUpper},
+		{Name: "transaction_isolation", Case: SCUpper},
 		{Name: "unique_checks", IsBoolean: true, SupportSetVar: true},
 		{Name: "updatable_views_with_limit", IsBoolean: true, SupportSetVar: true},
 	}