diff --git a/.appveyor.yml b/.appveyor.yml
index 1475068..11d7ee6 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -34,7 +34,7 @@ build_script:
   - cd snappycpp
   - mkdir build
   - cd build
-  - cmake .. -G "MinGW Makefiles" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin"
+  - cmake -E env CXXFLAGS="-w" cmake .. -G "MinGW Makefiles" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin"
   - mingw32-make
   - copy libsnappy.a C:\projects\%APPVEYOR_PROJECT_SLUG%\tests