diff --git a/pyproject.toml b/pyproject.toml
index 1c85950..740bc29 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -60,6 +60,10 @@ show_missing = true
 precision = 2
 fail_under = 100.00
 skip_covered = true
+exclude_also = [
+    # `if TYPE_CHECKING:` blocks are only executed while running mypy.
+    "if TYPE_CHECKING:",
+]
 
 [tool.isort]
 multi_line_output = 3