diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 694ba84c0..3bc6ac933 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,8 +29,11 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]  # todo: windows-latest - lack of iconv development files
+        shared: [0, 1]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
       - name: Build
+        env:
+          SHARED: ${{ matrix.shared }}
         run: make