Fix MinGW build issue in AppVeyor
diff --git a/appveyor.yml b/appveyor.yml
index 74c92f1..ef729eb 100755
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -62,7 +62,7 @@
    - PROFILE: MINGW
      PLATFORM: x64
      CONFIGURATION: RelWithDebInfo
-     DISABLED_TESTS: (StressTestNonBlocking)
+     DISABLED_TESTS: (StalenessCheckTest|StressTestNonBlocking)
 
    - PROFILE: CYGWIN
      PLATFORM: x64