diff --git a/src/pycalver/rewrite.py b/src/pycalver/rewrite.py
index b24e0c6..6f88a26 100644
--- a/src/pycalver/rewrite.py
+++ b/src/pycalver/rewrite.py
@@ -122,7 +122,7 @@ def _iter_file_paths(
         file_paths = glob.glob(globstr)
         if not any(file_paths):
             errmsg = f"No files found for path/glob '{globstr}'"
-            raise FileNotFoundError(errmsg)
+            raise IOError(errmsg)
         for file_path_str in file_paths:
             file_path = pl.Path(file_path_str)
             yield (file_path, pattern_strs)
diff --git a/test/test_rewrite.py b/test/test_rewrite.py
index ee65ade..d9d4613 100644
--- a/test/test_rewrite.py
+++ b/test/test_rewrite.py
@@ -80,8 +80,8 @@ def test_error_bad_path():
         (project.dir / "setup.py").unlink()
         try:
             list(rewrite._iter_file_paths(cfg.file_patterns))
-            assert False, "expected FileNotFoundError"
-        except FileNotFoundError as ex:
+            assert False, "expected IOError"
+        except IOError as ex:
             assert "setup.py" in str(ex)