diff --git a/.appveyor.yml b/.appveyor.yml
index 6737217647..79d0cc3b4b 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -2,6 +2,9 @@ branches:
   except:
     - dev
 version: '{build}'
+platform:
+  - x64
+  - x86
 image: Visual Studio 2017
 install:
   - cinst ninja
@@ -12,7 +15,7 @@ build_script:
   - bash ./tools/import-upstream.sh
   - bash -c 'cd src; ./get-clang.sh'
   - bash -c '~/.cargo/bin/sccache -s'
-  - bash -c 'cd src; ./build.sh'
+  - bash -c 'cd src; EXTRA_FLAGS=target_cpu=\"$PLATFORM\" ./build.sh'
   - bash -c '~/.cargo/bin/sccache -s'
   - ps: $env:BUILD_NAME="naiveproxy-$env:APPVEYOR_REPO_TAG_NAME-win64"
   - bash -c 'mkdir $BUILD_NAME'