diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index fad51b632..834e43375 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -21,7 +21,7 @@ jobs:
         with:
           platform: ${{ matrix.architecture }}
       - name: cmake
-        run: cmake -S . -B build -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On
+        run: cmake -S . -B build -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug -DJSON_BuildTests=On -DCMAKE_CXX_FLAGS=-Wa,-mbig-obj
       - name: build
         run: cmake --build build --parallel 10
       - name: test