diff --git a/pulser-core/pulser/register/base_register.py b/pulser-core/pulser/register/base_register.py
index f23552bb7..9b30c33bd 100644
--- a/pulser-core/pulser/register/base_register.py
+++ b/pulser-core/pulser/register/base_register.py
@@ -78,14 +78,13 @@ def __init__(
             [pm.AbstractArray(v, dtype=float) for v in qubits.values()]
         )
         self._ids: tuple[QubitId, ...] = tuple(qubits.keys())
-        not_str = [id for id in self._ids if not isinstance(id, str)]
-        if not_str:
+        if any(not isinstance(id, str) for id in self._ids):
             warnings.simplefilter("always")
             warnings.warn(
-                "Usage of `int`s as `QubitId`s will be deprecated. Define "
-                "your `QubitId`s as `str`s, prefer setting `prefix='q'` "
-                "when using classmethods, as that will become the new "
-                "default once `int` qubit IDs become invalid.",
+                "Usage of `int`s or any non-`str`types as `QubitId`s will be "
+                "deprecated. Define your `QubitId`s as `str`s, prefer setting "
+                "`prefix='q'` when using classmethods, as that will become the"
+                " new default once `int` qubit IDs become invalid.",
                 DeprecationWarning,
                 stacklevel=2,
             )
diff --git a/pyproject.toml b/pyproject.toml
index 65e6872bc..b71074177 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ filterwarnings = [
     "error",
     # Except these particular warnings, which are ignored
     'ignore:A duration of \d+ ns is not a multiple of:UserWarning',
-    'ignore:Usage of `int`s as `QubitId`s will be deprecated:DeprecationWarning',
+    'ignore:Usage of `int`s or any non-`str`types as `QubitId`s:DeprecationWarning',
     ]
 
 [build-system]
diff --git a/tests/test_abstract_repr.py b/tests/test_abstract_repr.py
index 4570060b3..f218fe77a 100644
--- a/tests/test_abstract_repr.py
+++ b/tests/test_abstract_repr.py
@@ -822,7 +822,7 @@ def test_exceptions(self, sequence):
             AbstractReprError, match="Name collisions encountered"
         ), pytest.warns(
             DeprecationWarning,
-            match="Usage of `int`s as `QubitId`s will be deprecated.",
+            match="Usage of `int`s or any non-`str`types as `QubitId`s",
         ):
             Register({"0": (0, 0), 0: (20, 20)})._to_abstract_repr()
 
diff --git a/tests/test_json.py b/tests/test_json.py
index 30997156c..4ee83a8c8 100644
--- a/tests/test_json.py
+++ b/tests/test_json.py
@@ -128,13 +128,13 @@ def test_detuning_map():
 def test_register_numbered_keys(reg_dict):
     with pytest.warns(
         DeprecationWarning,
-        match="Usage of `int`s as `QubitId`s will be deprecated.",
+        match="Usage of `int`s or any non-`str`types as `QubitId`s",
     ):
         reg = (Register if len(reg_dict[2]) == 2 else Register3D)(reg_dict)
     j = json.dumps(reg, cls=PulserEncoder)
     with pytest.warns(
         DeprecationWarning,
-        match="Usage of `int`s as `QubitId`s will be deprecated.",
+        match="Usage of `int`s or any non-`str`types as `QubitId`s",
     ):
         decoded_reg = json.loads(j, cls=PulserDecoder)
     assert reg == decoded_reg
diff --git a/tests/test_sequence.py b/tests/test_sequence.py
index 6c95e60fb..d13d5bc3d 100644
--- a/tests/test_sequence.py
+++ b/tests/test_sequence.py
@@ -1616,7 +1616,7 @@ def test_str(reg, device, mod_device, det_map):
     assert seq.__str__() == msg_ch0 + msg_ch1 + msg_det_map + measure_msg
     with pytest.warns(
         DeprecationWarning,
-        match="Usage of `int`s as `QubitId`s will be deprecated.",
+        match="Usage of `int`s or any non-`str`types as `QubitId`s",
     ):
         seq2 = Sequence(Register({"q0": (0, 0), 1: (5, 5)}), device)
     seq2.declare_channel("ch1", "rydberg_global")