diff --git a/filter_linux.go b/filter_linux.go
index d9aedca..abe1d9b 100644
--- a/filter_linux.go
+++ b/filter_linux.go
@@ -443,6 +443,8 @@ func parseU32Data(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error)
 					u32.RedirIndex = int(action.Ifindex)
 				}
 			}
+		case nl.TCA_U32_CLASSID:
+			u32.ClassId = native.Uint32(datum.Value)
 		}
 	}
 	return detailed, nil
diff --git a/filter_test.go b/filter_test.go
index dc4ff39..67d9ee9 100644
--- a/filter_test.go
+++ b/filter_test.go
@@ -51,6 +51,7 @@ func TestFilterAddDel(t *testing.T) {
 	if !ok {
 		t.Fatal("Qdisc is the wrong type")
 	}
+	classId := MakeHandle(1, 1)
 	filter := &U32{
 		FilterAttrs: FilterAttrs{
 			LinkIndex: link.Attrs().Index,
@@ -59,6 +60,7 @@ func TestFilterAddDel(t *testing.T) {
 			Protocol:  syscall.ETH_P_IP,
 		},
 		RedirIndex: redir.Attrs().Index,
+		ClassId:    classId,
 	}
 	if err := FilterAdd(filter); err != nil {
 		t.Fatal(err)
@@ -70,6 +72,13 @@ func TestFilterAddDel(t *testing.T) {
 	if len(filters) != 1 {
 		t.Fatal("Failed to add filter")
 	}
+	u32, ok := filters[0].(*U32)
+	if !ok {
+		t.Fatal("Filter is the wrong type")
+	}
+	if u32.ClassId != classId {
+		t.Fatalf("ClassId of the filter is the wrong value")
+	}
 	if err := FilterDel(filter); err != nil {
 		t.Fatal(err)
 	}
@@ -296,6 +305,7 @@ func TestFilterU32BpfAddDel(t *testing.T) {
 	if err != nil {
 		t.Skipf("Loading bpf program failed: %s", err)
 	}
+	classId := MakeHandle(1, 1)
 	filter := &U32{
 		FilterAttrs: FilterAttrs{
 			LinkIndex: link.Attrs().Index,
@@ -303,7 +313,7 @@ func TestFilterU32BpfAddDel(t *testing.T) {
 			Priority:  1,
 			Protocol:  syscall.ETH_P_ALL,
 		},
-		ClassId: MakeHandle(1, 1),
+		ClassId: classId,
 		Actions: []Action{
 			&BpfAction{Fd: fd, Name: "simple"},
 			&MirredAction{
@@ -335,6 +345,9 @@ func TestFilterU32BpfAddDel(t *testing.T) {
 	if len(u32.Actions) != 2 {
 		t.Fatalf("Too few Actions in filter")
 	}
+	if u32.ClassId != classId {
+		t.Fatalf("ClassId of the filter is the wrong value")
+	}
 	bpfAction, ok := u32.Actions[0].(*BpfAction)
 	if !ok {
 		t.Fatal("Action[0] is the wrong type")