diff --git a/src/qibolab/platform/platform.py b/src/qibolab/platform/platform.py
index e68d1dba0..74f957462 100644
--- a/src/qibolab/platform/platform.py
+++ b/src/qibolab/platform/platform.py
@@ -109,7 +109,7 @@ class Platform:
     topology: nx.Graph = field(default_factory=nx.Graph)
     """Graph representing the qubit connectivity in the quantum chip."""
 
-    wire_names: List[Union[int | str]] = None
+    wire_names: List[Union[int, str]] = None
     """List of physical qubit (wire) names."""
 
     def __post_init__(self):
@@ -121,7 +121,7 @@ def __post_init__(self):
         self.topology.add_edges_from(
             [(pair.qubit1.name, pair.qubit2.name) for pair in self.pairs.values()]
         )
-        self.wire_names = list(self.qubits.keys())
+        self.wire_names = list(self.qubits)
 
     def __str__(self):
         return self.name