diff --git a/pyop2/codegen/builder.py b/pyop2/codegen/builder.py
index 637f15ad2..6f3460c29 100644
--- a/pyop2/codegen/builder.py
+++ b/pyop2/codegen/builder.py
@@ -4,7 +4,6 @@
 from functools import reduce
 
 import numpy
-from loopy.types import OpaqueType
 from pyop2.global_kernel import (GlobalKernelArg, DatKernelArg, MixedDatKernelArg,
                                  MatKernelArg, MixedMatKernelArg, PermutedMapKernelArg, ComposedMapKernelArg, PassthroughKernelArg)
 from pyop2.codegen.representation import (Accumulate, Argument, Comparison, Conditional,
diff --git a/pyop2/op2.py b/pyop2/op2.py
index e0d36e194..5f48c04c5 100644
--- a/pyop2/op2.py
+++ b/pyop2/op2.py
@@ -36,7 +36,7 @@
 import atexit
 
 from pyop2.configuration import configuration
-from pyop2.datatypes import PetscMatType
+from pyop2.datatypes import PetscMatType  # noqa: F401
 from pyop2.logger import debug, info, warning, error, critical, set_log_level
 from pyop2.mpi import MPI, COMM_WORLD, collective
 
diff --git a/pyop2/parloop.py b/pyop2/parloop.py
index 776fec92d..abce99e03 100644
--- a/pyop2/parloop.py
+++ b/pyop2/parloop.py
@@ -665,7 +665,7 @@ class PassthroughArg(LegacyArg):
     """Argument that is simply passed to the local kernel without packing.
 
     :param dtype: The datatype of the argument. This is needed for code generation.
-    :param data: 
+    :param data: A pointer to the data.
     """
     # We don't know what the local kernel is doing with this argument
     access = Access.RW
diff --git a/pyop2/types/__init__.py b/pyop2/types/__init__.py
index 03a6b9963..b33a4c1de 100644
--- a/pyop2/types/__init__.py
+++ b/pyop2/types/__init__.py
@@ -1,5 +1,4 @@
 import enum
-from loopy.types import OpaqueType
 
 from .access import *  # noqa: F401
 from .data_carrier import *  # noqa: F401
diff --git a/test/unit/test_direct_loop.py b/test/unit/test_direct_loop.py
index 45fd0ef5c..355510997 100644
--- a/test/unit/test_direct_loop.py
+++ b/test/unit/test_direct_loop.py
@@ -286,7 +286,6 @@ def test_passthrough_mat(self):
         )
 
 
-
 if __name__ == '__main__':
     import os
     pytest.main(os.path.abspath(__file__))