diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9b7ed45b..cd9d3ddd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,3 +42,18 @@ jobs:
         run: zig build test
       - name: webgpu::test
         run: cd webgpu && zig build test
+  mac:
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Zig
+        run: |
+          brew install xz
+          sudo sh -c 'wget -c https://ziglang.org/builds/zig-macos-x86_64-0.9.0-dev.453+7ef854682.tar.xz -O - | tar -xJ --strip-components=1 -C /usr/local/bin'
+      - name: mach::test
+        run: zig build test
+        env:
+          AGREE: true
+      - name: webgpu::test
+        run: cd webgpu && zig build test
diff --git a/glfw/src/main.zig b/glfw/src/main.zig
index 6bb113b4..4e0c3cae 100644
--- a/glfw/src/main.zig
+++ b/glfw/src/main.zig
@@ -7,6 +7,7 @@ pub fn basicTest() void {
     if (c.glfwInit() != c.GLFW_TRUE) {
         @panic("failed to init");
     }
+    c.glfwWindowHint(c.GLFW_VISIBLE, c.GLFW_FALSE);
     const window = c.glfwCreateWindow(640, 480, "GLFW example", null, null);
     if (window == null) {
         c.glfwTerminate();