diff --git a/.github/workflows/spec-tests.yml b/.github/workflows/spec-tests.yml
index cd85e30..2b1ee5d 100644
--- a/.github/workflows/spec-tests.yml
+++ b/.github/workflows/spec-tests.yml
@@ -14,6 +14,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+    - name: Install prerequisites
+      run: sudo apt-get install gcc-multilib
     - name: Run CMake
       env:
         CC: ${{ matrix.compiler }}