diff --git a/src/styxdefs/runner.py b/src/styxdefs/runner.py
index 39a1088..f7d1a20 100644
--- a/src/styxdefs/runner.py
+++ b/src/styxdefs/runner.py
@@ -21,7 +21,7 @@ def __init__(self, logger: logging.Logger, dir: pathlib.Path) -> None:
 
     def input_file(self, host_file: InputPathType) -> str:
         """Resolve host input files."""
-        return str(host_file)
+        return str(pathlib.Path(host_file).absolute())
 
     def output_file(self, local_file: str, optional: bool = False) -> OutputPathType:
         """Resolve local output files."""