diff --git a/.github/workflows/build_flang.yml b/.github/workflows/build_flang.yml
index 2f019b0e656..062da9194f6 100644
--- a/.github/workflows/build_flang.yml
+++ b/.github/workflows/build_flang.yml
@@ -86,7 +86,7 @@ jobs:
       - name: Build and install flang & libpgmath
         run: |
           ${{ env.install_prefix }}/bin/clang --version
-          ./build-flang.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -n $(nproc) -c -s -v
+          ./build-flang.sh -t ${{ matrix.target }} -d RelWithDebInfo -p ${{ env.install_prefix }} -n $(nproc) -c -s -v
 
       - name: Copy llvm-lit
         run: |
diff --git a/.github/workflows/build_flang_arm64.yml b/.github/workflows/build_flang_arm64.yml
index 8d4a07c4814..ac20c0a2894 100644
--- a/.github/workflows/build_flang_arm64.yml
+++ b/.github/workflows/build_flang_arm64.yml
@@ -54,7 +54,7 @@ jobs:
       - name: Build and install flang & libpgmath
         run: |
           cd ${{ env.build_path }}/flang
-          ./build-flang.sh -t ${{ matrix.target }} -p ${{ env.install_prefix }} -n `nproc --ignore=1` -v
+          ./build-flang.sh -t ${{ matrix.target }} -d RelWithDebInfo -p ${{ env.install_prefix }} -n `nproc --ignore=1` -v
 
       # Copy llvm-lit
       - name: Copy llvm-lit