From 25b8659c133e1795d24c296b90198ec8ba6e69e4 Mon Sep 17 00:00:00 2001
From: dcherian <deepak@cherian.net>
Date: Fri, 30 Aug 2019 11:55:15 -0600
Subject: [PATCH] reduce silly changes.

---
 xarray/core/combine.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xarray/core/combine.py b/xarray/core/combine.py
index 167b5a93ebc..e35bb51e030 100644
--- a/xarray/core/combine.py
+++ b/xarray/core/combine.py
@@ -248,7 +248,7 @@ def _combine_1d(
                 join=join,
             )
         except ValueError as err:
-            if "Encountered unexpected variable" in str(err):
+            if "encountered unexpected variable" in str(err):
                 raise ValueError(
                     "These objects cannot be combined using only "
                     "xarray.combine_nested, instead either use "