diff --git a/importlib_resources/_common.py b/importlib_resources/_common.py
index 6a338c6..3c6de1c 100644
--- a/importlib_resources/_common.py
+++ b/importlib_resources/_common.py
@@ -203,6 +203,5 @@ def _write_contents(target, source):
         for item in source.iterdir():
             _write_contents(child, item)
     else:
-        with child.open('wb') as fp:
-            fp.write(source.read_bytes())
+        child.write_bytes(source.read_bytes())
     return child