diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -625,8 +625,7 @@
           -DCMAKE_C_COMPILER=x86_64-w64-mingw32-clang \
           -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-clang++ \
           -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake"
-    echo "+++ Running the libc++ tests"
-    ${NINJA} -vC "${BUILD_DIR}" check-cxx
+    check-runtimes
 ;;
 mingw-static)
     clean
@@ -636,8 +635,7 @@
           -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake" \
           -DLIBCXX_ENABLE_SHARED=OFF \
           -DLIBUNWIND_ENABLE_SHARED=OFF
-    echo "+++ Running the libc++ tests"
-    ${NINJA} -vC "${BUILD_DIR}" check-cxx
+    check-runtimes
 ;;
 mingw-dll-i686)
     clean
@@ -645,8 +643,7 @@
           -DCMAKE_C_COMPILER=i686-w64-mingw32-clang \
           -DCMAKE_CXX_COMPILER=i686-w64-mingw32-clang++ \
           -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake"
-    echo "+++ Running the libc++ tests"
-    ${NINJA} -vC "${BUILD_DIR}" check-cxx
+    check-runtimes
 ;;
 aix)
     clean