diff --git a/src/qibo/transpiler/blocks.py b/src/qibo/transpiler/blocks.py
index 199979767e..6e2b1122a2 100644
--- a/src/qibo/transpiler/blocks.py
+++ b/src/qibo/transpiler/blocks.py
@@ -200,12 +200,11 @@ def block_decomposition(circuit: Circuit, fuse: bool = True):
         remove_list = [first_block]
         if len(initial_blocks[1:]) > 0:
             for second_block in initial_blocks[1:]:
-                try:
+                if second_block.qubits == first_block.qubits:
                     first_block = first_block.fuse(second_block)
                     remove_list.append(second_block)
-                except BlockingError:
-                    if not first_block.commute(second_block):
-                        break
+                elif not first_block.commute(second_block):
+                    break
         blocks.append(first_block)
         _remove_gates(initial_blocks, remove_list)
 
diff --git a/src/qibo/transpiler/router.py b/src/qibo/transpiler/router.py
index 8a3bf54180..6023296d8c 100644
--- a/src/qibo/transpiler/router.py
+++ b/src/qibo/transpiler/router.py
@@ -379,7 +379,9 @@ def __call__(self, circuit: Circuit, initial_layout: dict):
             else:
                 self._find_new_mapping()
 
-        routed_circuit = self.circuit.routed_circuit(circuit_kwargs=circuit.init_kwargs)
+        circuit_kwargs = circuit.init_kwargs
+        circuit_kwargs["wire_names"] = list(initial_layout.keys())
+        routed_circuit = self.circuit.routed_circuit(circuit_kwargs=circuit_kwargs)
         if self._final_measurements is not None:
             routed_circuit = self._append_final_measurements(
                 routed_circuit=routed_circuit
@@ -658,7 +660,9 @@ def __call__(self, circuit: Circuit, initial_layout: dict):
             else:
                 self._find_new_mapping()
 
-        routed_circuit = self.circuit.routed_circuit(circuit_kwargs=circuit.init_kwargs)
+        circuit_kwargs = circuit.init_kwargs
+        circuit_kwargs["wire_names"] = list(initial_layout.keys())
+        routed_circuit = self.circuit.routed_circuit(circuit_kwargs=circuit_kwargs)
         if self._final_measurements is not None:
             routed_circuit = self._append_final_measurements(
                 routed_circuit=routed_circuit
diff --git a/src/qibo/transpiler/unroller.py b/src/qibo/transpiler/unroller.py
index c62ae4e273..6b8f3e9c60 100644
--- a/src/qibo/transpiler/unroller.py
+++ b/src/qibo/transpiler/unroller.py
@@ -85,7 +85,7 @@ def __call__(self, circuit: Circuit):
         Returns:
             (:class:`qibo.models.circuit.Circuit`): equivalent circuit with native gates.
         """
-        translated_circuit = circuit.__class__(circuit.nqubits)
+        translated_circuit = Circuit(**circuit.init_kwargs)
         for gate in circuit.queue:
             translated_circuit.add(
                 translate_gate(
diff --git a/tests/test_transpiler_pipeline.py b/tests/test_transpiler_pipeline.py
index ce8afee66d..94d2c4b539 100644
--- a/tests/test_transpiler_pipeline.py
+++ b/tests/test_transpiler_pipeline.py
@@ -237,6 +237,7 @@ def test_custom_passes_restict(gates, placer, routing):
         final_layout=final_layout,
         native_gates=NativeGates.default(),
     )
+    assert transpiled_circ.wire_names == ["q1", "q2", "q3"]
 
 
 def test_custom_passes_multiple_placer():
diff --git a/tests/test_transpiler_router.py b/tests/test_transpiler_router.py
index 2cf2364fe9..7a7ef17583 100644
--- a/tests/test_transpiler_router.py
+++ b/tests/test_transpiler_router.py
@@ -348,6 +348,7 @@ def test_restrict_qubits(router_algorithm):
     )
     assert_connectivity(restricted_connectivity, routed_circ)
     assert_placement(routed_circ, final_layout, connectivity=restricted_connectivity)
+    assert routed_circ.wire_names == ["q0", "q2", "q3"]
 
 
 def test_star_error_multi_qubit():