diff --git a/WDL/Error.py b/WDL/Error.py
index e45b0cf5..091efae7 100644
--- a/WDL/Error.py
+++ b/WDL/Error.py
@@ -1,12 +1,43 @@
 # pyre-strict
-from typing import List, Optional, Union, Iterable, TypeVar, Generator, Callable, Any, Dict
+from typing import (
+    List,
+    Optional,
+    Union,
+    Iterable,
+    TypeVar,
+    Generator,
+    Callable,
+    Any,
+    Dict,
+    NamedTuple,
+)
 from functools import total_ordering
 from contextlib import contextmanager
 
-from ._error_util import SourcePosition
 from . import Type
 
 
+class SourcePosition(
+    NamedTuple(
+        "SourcePosition",
+        [
+            ("uri", str),
+            ("abspath", str),
+            ("line", int),
+            ("column", int),
+            ("end_line", int),
+            ("end_column", int),
+        ],
+    )
+):
+    """
+    Source position attached to AST nodes and exceptions; NamedTuple of ``uri`` the filename/URI
+    passed to :func:`WDL.load` or a WDL import statement, which may be relative; ``abspath`` the
+    absolute filename/URI; and one-based int positions ``line`` ``end_line`` ``column``
+    ``end_column``
+    """
+
+
 class SyntaxError(Exception):
     """Failure to lex/parse a WDL document"""
 
diff --git a/WDL/_error_util.py b/WDL/_error_util.py
deleted file mode 100644
index d8e7b32f..00000000
--- a/WDL/_error_util.py
+++ /dev/null
@@ -1,22 +0,0 @@
-from typing import NamedTuple
-
-
-class SourcePosition(
-    NamedTuple(
-        "SourcePosition",
-        [
-            ("uri", str),
-            ("abspath", str),
-            ("line", int),
-            ("column", int),
-            ("end_line", int),
-            ("end_column", int),
-        ],
-    )
-):
-    """
-    Source position attached to AST nodes and exceptions; NamedTuple of ``uri`` the filename/URI
-    passed to :func:`WDL.load` or a WDL import statement, which may be relative; ``abspath`` the
-    absolute filename/URI; and one-based int positions ``line`` ``end_line`` ``column``
-    ``end_column``
-    """