diff --git a/pytket/extensions/qiskit/backends/aer.py b/pytket/extensions/qiskit/backends/aer.py
index 1a465e22..dbbf2df7 100644
--- a/pytket/extensions/qiskit/backends/aer.py
+++ b/pytket/extensions/qiskit/backends/aer.py
@@ -225,7 +225,7 @@ def default_compilation_pass(
             and self._backend_info.get_misc("characterisation")
         ):
             return self._arch_dependent_default_compilation_pass(
-                arch,
+                arch,  # type: ignore
                 optimisation_level,  # type: ignore
             )
 
@@ -343,9 +343,9 @@ def get_result(self, handle: ResultHandle, **kwargs: KwargTypes) -> BackendResul
                 include_density_matrix=self._supports_density_matrix,
             )
             for circ_index, backres in enumerate(backresults):
-                self._cache[ResultHandle(jobid, circ_index, qubit_n, ppc)][
-                    "result"
-                ] = backres
+                self._cache[ResultHandle(jobid, circ_index, qubit_n, ppc)]["result"] = (
+                    backres
+                )
 
             return cast(BackendResult, self._cache[handle]["result"])
 
diff --git a/pytket/extensions/qiskit/backends/ibm_utils.py b/pytket/extensions/qiskit/backends/ibm_utils.py
index ff261cd4..d7987bab 100644
--- a/pytket/extensions/qiskit/backends/ibm_utils.py
+++ b/pytket/extensions/qiskit/backends/ibm_utils.py
@@ -30,7 +30,7 @@
 from qiskit.transpiler import CouplingMap, PassManager  # type: ignore
 from qiskit.transpiler.passes import SabreLayout, SetLayout  # type: ignore
 from qiskit.transpiler.passmanager_config import PassManagerConfig  # type: ignore
-from qiskit.transpiler.preset_passmanagers import common
+from qiskit.transpiler.preset_passmanagers import common  # type: ignore
 
 from ..qiskit_convert import qiskit_to_tk, tk_to_qiskit
 
@@ -103,7 +103,7 @@ def _architecture_to_couplingmap(architecture: Architecture) -> CouplingMap:
 
 def _gen_lightsabre_transformation(
     architecture: Architecture, optimization_level: int = 2, seed=0, attempts=20
-) -> Callable[Circuit, Circuit]:
+) -> Callable[[Circuit], Circuit]:
     """
     Generates a function that can be passed to CustomPass for running
     LightSABRE routing.
diff --git a/pytket/extensions/qiskit/qiskit_convert.py b/pytket/extensions/qiskit/qiskit_convert.py
index 49dcb584..5283f312 100644
--- a/pytket/extensions/qiskit/qiskit_convert.py
+++ b/pytket/extensions/qiskit/qiskit_convert.py
@@ -29,7 +29,7 @@
 from uuid import UUID
 
 import numpy as np
-import sympy
+import sympy # type: ignore
 from numpy.typing import NDArray
 from qiskit_ibm_runtime.models.backend_configuration import (  # type: ignore
     PulseBackendConfiguration,
@@ -69,7 +69,7 @@
     ClassicalRegister,
     QuantumCircuit,
     QuantumRegister,
-)
+) # type: ignore
 from qiskit.circuit import (
     Barrier,
     Clbit,