diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1d0060a4..60c4b750 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -49,7 +49,8 @@ jobs:
             jid: 5
             goal: "build"
             gamos: "windows"
-            python: 3.9.0 
+            python: 3.9.0
+            pyarch: "x64" 
             platform: "x86_64"
           - os: windows-2019
             jid: 6
@@ -57,6 +58,7 @@ jobs:
             gamos: "windows"
             platform: "x86"
             python: 3.9.0
+            pyarch: "x86"
           - os: ubuntu-20.04
             goal: "test"
             python: "3.6"
@@ -108,7 +110,7 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python }}
-          architecture: ${{ matrix.PLATFORM }}
+          architecture: ${{ matrix.pyarch }}
 
       - name: Set env variables for pre-compiled Python
         if: matrix.goal == 'test'