diff --git a/.github/workflows/build_openbsd.yml b/.github/workflows/build_openbsd.yml
new file mode 100644
index 0000000..397c1d7
--- /dev/null
+++ b/.github/workflows/build_openbsd.yml
@@ -0,0 +1,57 @@
+name: Build (OpenBSD)
+
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    branches:
+      - '*'
+
+jobs:
+  build_openbsd:
+    name: Build on ${{ matrix.box }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        box:
+          - generic/openbsd7
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Provision VM
+      uses: hummeltech/freebsd-vagrant-action@v1.4
+      with:
+        box: ${{ matrix.box }}
+        save_box_to_cache: true
+        provision-commands: >-
+          pkg_add -I install bash rsync-3.2.7p1;
+          echo 'AcceptEnv *' >> /etc/ssh/sshd_config;
+          rcctl restart sshd;
+          mkdir -p ${{ github.workspace }};
+          chown vagrant:vagrant ${{ github.workspace }};
+          mkdir -p ${{ runner.temp }};
+          chown vagrant:vagrant ${{ runner.temp }};
+
+    - name: Install packages
+      run: sudo pkg_add -I cmake python3
+
+    - name: Generate build system
+      run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX="" -DLIBCPUID_ENABLE_TESTS=ON
+
+    - name: Build
+      run: cmake --build build
+
+    - name: Run cpuid_tool
+      run: ./build/cpuid_tool/cpuid_tool --save=- --all
+
+    - name: Run tests
+      run: |
+        make -C build consistency
+        make -C build test-old
+
+    - name: Install
+      run: cmake --install build
+      env:
+        DESTDIR: ${{ github.workspace }}/installdir
diff --git a/Readme.md b/Readme.md
index 2dd6477..6901906 100644
--- a/Readme.md
+++ b/Readme.md
@@ -27,7 +27,7 @@ libcpuid support varies depending on the features:
 |Linux|:heavy_check_mark: ![Linux workflow status](https://github.com/anrieff/libcpuid/actions/workflows/build_linux.yml/badge.svg)|:heavy_check_mark: ([`msr` kernel module](https://man7.org/linux/man-pages/man4/msr.4.html))|:heavy_check_mark:¹ ([`cpuid` out-of-tree kernel module](https://github.com/anrieff/libcpuid/tree/master/drivers/arm/linux))|
 |macOS|:heavy_check_mark: ![macOS workflow status](https://github.com/anrieff/libcpuid/actions/workflows/build_macos.yml/badge.svg)|:x:|:x:|
 |NetBSD|:grey_question:|:x:|:x:|
-|OpenBSD|:grey_question:|:x:|:x:|
+|OpenBSD|:heavy_check_mark: ![OpenBSD BSD workflow status](https://github.com/anrieff/libcpuid/actions/workflows/build_openbsd.yml/badge.svg)|:x:|:x:|
 |Windows|:heavy_check_mark: ![Windows workflow status](https://github.com/anrieff/libcpuid/actions/workflows/build_windows.yml/badge.svg)|:heavy_check_mark: ([`msr` driver](https://github.com/anrieff/libcpuid/tree/master/drivers/x86/windows/msr))|:x:|
 
 Legend: