diff --git a/.appveyor.yml b/.appveyor.yml
index dbf6ee22..1dfc86b8 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -163,6 +163,13 @@ build: off
 test_script: ci\build.bat
 
 for:
+  - matrix:
+      only: [FLAVOR: 'mingw64 (32-bit)']
+    build_script: |
+        echo %PATH%
+        cd %ADDPATH%
+        dir /s *.dll
+
   # CodeCov coverage build
   - matrix:
       only: [COVERAGE: true]
diff --git a/.github/workflows/ci_tests.yml b/.github/workflows/ci_tests.yml
index d2ae15f4..ccee9601 100644
--- a/.github/workflows/ci_tests.yml
+++ b/.github/workflows/ci_tests.yml
@@ -56,6 +56,15 @@ jobs:
       with:
         path: ${{env.DEP_DIR}}
         key: ${{matrix.os}}-${{matrix.generator}}-${{env.BOOST_VERSION}}
+    - name: COMPILERS
+      if: matrix.os == 'windows-2019'
+      run: |
+        for i in libstdc++-6.dll libgcc_s_seh-1.dll libwinpthread-1.dll; do
+          echo "- $i"
+          diff -q /c/mingw64/bin/$i /c/mingw64/x86_64-w64-mingw32/lib/$i || echo "Different"
+          diff -q /c/mingw64/bin/$i /mingw64/bin/$i || echo "Different2"
+        done
+        echo "/c/mingw64/x86_64-w64-mingw32/lib" >> "$GITHUB_PATH"
     # Install newer CMake to be able to find Boost
     - name: Install CMake
       if: runner.os == 'Linux' && matrix.standalone == 'Boost'