diff --git a/internal/ethapi/api_test.go b/internal/ethapi/api_test.go
index 3f69f86144..bc6bf37a29 100644
--- a/internal/ethapi/api_test.go
+++ b/internal/ethapi/api_test.go
@@ -1037,11 +1037,8 @@ func TestSignBlobTransaction(t *testing.T) {
 	}
 
 	_, err = api.SignTransaction(context.Background(), argsFromTransaction(res.Tx, b.acc.Address))
-	if err == nil {
-		t.Fatalf("should fail on blob transaction")
-	}
-	if !errors.Is(err, errBlobTxNotSupported) {
-		t.Errorf("error mismatch. Have: %v, want: %v", err, errBlobTxNotSupported)
+	if err != nil {
+		t.Fatalf("should not fail on blob transaction")
 	}
 }
 
diff --git a/signer/core/apitypes/types_test.go b/signer/core/apitypes/types_test.go
index 761b2ef5af..daffdefc2a 100644
--- a/signer/core/apitypes/types_test.go
+++ b/signer/core/apitypes/types_test.go
@@ -72,10 +72,14 @@ func TestTxArgs(t *testing.T) {
 		if err := json.Unmarshal(tc.data, &txArgs); err != nil {
 			t.Fatal(err)
 		}
-		if have := txArgs.ToTransaction().Type(); have != tc.wantType {
+		tx, err := txArgs.ToTransaction()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if have := tx.Type(); have != tc.wantType {
 			t.Errorf("test %d, have type %d, want type %d", i, have, tc.wantType)
 		}
-		if have := txArgs.ToTransaction().Hash(); have != tc.want {
+		if have := tx.Hash(); have != tc.want {
 			t.Errorf("test %d: have %v, want %v", i, have, tc.want)
 		}
 		d2, err := json.Marshal(txArgs)