diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d7336b982..20b63e142 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -102,7 +102,7 @@ jobs:
         mkdir build && cd build
         # Rust's ASAN requires the build system to explicitly pass a --target triple. We read that
         # value from CMake variable Rust_CARGO_TARGET (shared with corrosion).
-        cmake .. -DASAN=1 -DRust_CARGO_TARGET=x86_64-unknown-linux-gnu
+        cmake .. -DASAN=1 -DRust_CARGO_TARGET=x86_64-unknown-linux-gnu -DCMAKE_BUILD_TYPE=Debug
     - name: make
       run: |
         make