diff --git a/src/dolfinx_adjoint/blocks/_vector.py b/src/dolfinx_adjoint/blocks/_vector.py
index d7e9177..e9645c4 100644
--- a/src/dolfinx_adjoint/blocks/_vector.py
+++ b/src/dolfinx_adjoint/blocks/_vector.py
@@ -41,6 +41,15 @@ def _vector(
     Returns:
         A distributed vector.
     """
+    vtype: (
+        type[dolfinx.cpp.la.Vector_float32]
+        | type[dolfinx.cpp.la.Vector_float64]
+        | type[dolfinx.cpp.la.Vector_complex64]
+        | type[dolfinx.cpp.la.Vector_complex128]
+        | type[dolfinx.cpp.la.Vector_int8]
+        | type[dolfinx.cpp.la.Vector_int32]
+        | type[dolfinx.cpp.la.Vector_int64]
+    )
     if np.issubdtype(dtype, np.float32):
         vtype = dolfinx.cpp.la.Vector_float32
     elif np.issubdtype(dtype, np.float64):
diff --git a/src/dolfinx_adjoint/types/function.py b/src/dolfinx_adjoint/types/function.py
index 15b0d7e..8168012 100644
--- a/src/dolfinx_adjoint/types/function.py
+++ b/src/dolfinx_adjoint/types/function.py
@@ -89,7 +89,7 @@ def _ad_dot(self, other: typing.Self, options: typing.Optional[dict] = None):
         options = {} if options is None else options
         riesz_representation = options.get("riesz_representation", "l2")
         if riesz_representation == "l2":
-            return dolfinx.cpp.la.inner_product(self.x._cpp_object, other.x._cpp_object)
+            return dolfinx.cpp.la.inner_product(self.x._cpp_object, other.x._cpp_object)  # type: ignore[arg-type]
         elif riesz_representation == "L2":
             form_compiler_options = options.get("form_compiler_options", None)
             jit_options = options.get("jit_options", None)
diff --git a/tests/test_poisson_mother.py b/tests/test_poisson_mother.py
index ee465f4..6aa0892 100644
--- a/tests/test_poisson_mother.py
+++ b/tests/test_poisson_mother.py
@@ -136,8 +136,8 @@ def reference_solution(
     J_org = mesh.comm.allreduce(dolfinx.fem.assemble_scalar(dolfinx.fem.form(J_compiled)), op=MPI.SUM)
     steps = [step_length * (1 / 2) ** i for i in range(num_steps)]
 
-    dJac_dm = dolfinx.cpp.la.inner_product(Jac_vec._cpp_object, dm.x._cpp_object)
-    Hm_dm = dolfinx.cpp.la.inner_product(Hm_vec._cpp_object, dm.x._cpp_object)
+    dJac_dm = dolfinx.cpp.la.inner_product(Jac_vec._cpp_object, dm.x._cpp_object)  # type: ignore[arg-type]
+    Hm_dm = dolfinx.cpp.la.inner_product(Hm_vec._cpp_object, dm.x._cpp_object)  # type: ignore[arg-type]
 
     errors = []
     errors_der = []