diff --git a/sentieon_cli/__init__.py b/sentieon_cli/__init__.py
index 36acce7..129ad9b 100644
--- a/sentieon_cli/__init__.py
+++ b/sentieon_cli/__init__.py
@@ -168,7 +168,7 @@ def _path_arg(arg: str) -> pathlib.Path:
 def dnascope_longread(
     output_vcf: pathlib.Path,
     reference: Optional[pathlib.Path] = None,
-    sample_input: Optional[list[pathlib.Path]] = None,
+    sample_input: Optional[List[pathlib.Path]] = None,
     model_bundle: Optional[pathlib.Path] = None,
     dbsnp: Optional[pathlib.Path] = None,
     bed: Optional[pathlib.Path] = None,