diff --git a/.appveyor.yml b/.appveyor.yml
index 037c8d6df6..9ebe41e1c8 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -30,7 +30,7 @@ environment:
       ssl: OpenSSL-v111
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       GEMS_FOR_TEST: ""
-  RELINE_TEST_ENCODING: "Windows-31J"
+  RELINE_TEST_ENCODING: "UTF-8"
 for:
 -
   matrix: