diff --git a/types.go b/types.go
index 763fa43..d3b9dbf 100644
--- a/types.go
+++ b/types.go
@@ -166,11 +166,5 @@ const (
 
 // conntrack attributes
 const (
-	ctaTupleOrig  = 1
-	ctaTupleReply = 2
-	ctaStatus     = 3
-	ctaTimeout    = 7
-	ctaMark       = 8
-	ctaProtoInfo  = 4
-	ctaLabels     = 22
+	ctaMark = 8
 )