diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 99ca48dec..0dc0b8b6a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -147,3 +147,22 @@ jobs:
         python3 -c "from urllib.request import urlretrieve; urlretrieve('${{ env.BUILDER_HOST }}/${{ env.BUILDER_SOURCE }}/${{ env.BUILDER_VERSION }}/builder.pyz?run=${{ env.RUN }}', 'builder')"
         chmod a+x builder
         ./builder build -p ${{ env.PACKAGE_NAME }}
+
+  openbsd:
+    runs-on: ubuntu-22.04 # latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build ${{ env.PACKAGE_NAME }} + consumers
+        id: test
+        uses: cross-platform-actions/action@v0.23.0
+        with:
+          operating_system: openbsd
+          architecture: x86-64
+          version: '7.4'
+          cpu_count: 4
+          shell: bash
+          run: |
+            sudo pkg_add py3-urllib3
+            python3 -c "from urllib.request import urlretrieve; urlretrieve('${{ env.BUILDER_HOST }}/${{ env.BUILDER_SOURCE }}/${{ env.BUILDER_VERSION }}/builder.pyz?run=${{ env.RUN }}', 'builder')"
+            chmod a+x builder
+            ./builder build -p ${{ env.PACKAGE_NAME }}
diff --git a/builder.json b/builder.json
index c44ce1dba..434ebcfb4 100644
--- a/builder.json
+++ b/builder.json
@@ -5,7 +5,7 @@
         { "name": "aws-c-cal" },
         {
             "name": "s2n",
-            "targets": ["linux", "android"]
+            "targets": ["linux", "android", "openbsd"]
         }
     ],
     "downstream": [