diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4faa0210..1ea65f82 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,9 @@
 # Changelog
 
-## 1.12.6 - 11/32/16
+## 1.12.6 - 12/02/16
 
 *   regression bugfix on timeout [#344](https://github.com/amoffat/sh/issues/344)
+*   regression bugfix on `_ok_code=None`
 
 ## 1.12.5 - 12/01/16
 
diff --git a/sh.py b/sh.py
index 396cf2d6..4acd6e59 100644
--- a/sh.py
+++ b/sh.py
@@ -1186,6 +1186,13 @@ def __call__(self, *args, **kwargs):
         call_args.update(extracted_call_args)
 
 
+        # handle a None.  this is added back only to not break the api in the
+        # 1.* version.  TODO remove this in 2.0, as "ok_code", if specified,
+        # should always be a definitive value or list of values, and None is
+        # ambiguous
+        if call_args["ok_code"] is None:
+            call_args["ok_code"] = 0
+
         if not getattr(call_args["ok_code"], "__iter__", None):
             call_args["ok_code"] = [call_args["ok_code"]]