diff --git a/numcodecs/checksum32.py b/numcodecs/checksum32.py
index d5f6a8da..180907cc 100644
--- a/numcodecs/checksum32.py
+++ b/numcodecs/checksum32.py
@@ -9,7 +9,7 @@
 from .compat import ensure_contiguous_ndarray, ndarray_copy
 from .jenkins import jenkins_lookup3
 
-if TYPE_CHECKING:
+if TYPE_CHECKING:  # pragma: no cover
     from typing_extensions import Buffer
 
 CHECKSUM_LOCATION = Literal['start', 'end']
diff --git a/numcodecs/tests/test_zarr3.py b/numcodecs/tests/test_zarr3.py
index afb77136..d5b7fdc8 100644
--- a/numcodecs/tests/test_zarr3.py
+++ b/numcodecs/tests/test_zarr3.py
@@ -5,10 +5,10 @@
 import numpy as np
 import pytest
 
-if not TYPE_CHECKING:
-    zarr = pytest.importorskip("zarr")
-else:
+if TYPE_CHECKING:  # pragma: no cover
     import zarr
+else:
+    zarr = pytest.importorskip("zarr")
 
 import zarr.storage
 from zarr.core.common import JSON