diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 72eb983..2c44566 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,13 +10,14 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         compiler: [g++, clang++]
+        sanitize: ["", "-fsanitize=address", "-fsanitize=undefined"]
 
     steps:
     - uses: actions/checkout@v1
     - name: configure
       run: |
         mkdir build && cd build
-        CXX=`which ${{ matrix.compiler }}` cmake ..
+        CXX=`which ${{ matrix.compiler }}` cmake .. -DCMAKE_CXX_FLAGS="${{ matrix.sanitize }}"
     - name: build
       run: cmake --build build --parallel 2
     - name: test