diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 7d111176..8a929cf1 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -59,7 +59,7 @@ jobs:
     - name: build and install conda package
       env:
         LIBRARY_PATH: ${{ github.workspace }}/../sbcl/src/runtime
-        MSYS2_CMD: "D:\\a\\_temp\\setup-msys2\\msys2.CMD -c"
+        MSYS2_CMD: D:\a\_temp\setup-msys2\msys2.CMD
       shell: pwsh
       run: |
         conda install conda-build
diff --git a/recipe/build.ps1 b/recipe/build.ps1
index e942c523..759a2a4c 100644
--- a/recipe/build.ps1
+++ b/recipe/build.ps1
@@ -2,10 +2,10 @@ pushd lib
 mkdir build
 pushd build
 # Build libsbcl_librarian
-& $env:MSYS2_CMD "echo 'hello'"
-& $env:MSYS2_CMD "cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -G 'MSYS Makefiles' .."
-& $env:MSYS2_CMD "cmake --build ."
-& $env:MSYS2_CMD "cmake --install . --prefix=$PREFIX"
+& $env:MSYS2_CMD -c "echo 'hello'"
+& $env:MSYS2_CMD -c "cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -G 'MSYS Makefiles' .."
+& $env:MSYS2_CMD -c "cmake --build ."
+& $env:MSYS2_CMD -c "cmake --install . --prefix=$PREFIX"
 popd
 popd