diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index abc533f..9c69fb0 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -19,6 +19,13 @@ jobs:
           - windows-latest
         arch:
           - x64
+          - x86
+        exclude:
+          # Test 32-bit only on Linux
+          - os: macOS-latest
+            arch: x86
+          - os: windows-latest
+            arch: x86
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1