diff --git a/.github/actions/install-nix/action.yml b/.github/actions/install-nix/action.yml
index c9d502d..5a4fee0 100644
--- a/.github/actions/install-nix/action.yml
+++ b/.github/actions/install-nix/action.yml
@@ -12,11 +12,11 @@ runs:
       with:
         key: ${{ inputs.cache-key-python }}
     - name: install Ninja on Linux
-      if: matrix.generator == 'Ninja' && startsWith(matrix.platform, 'ubuntu')
+      if: startsWith(matrix.platform, 'ubuntu')
       shell: bash
       run: sudo apt install ninja-build
     - name: install Ninja on OSX
-      if: matrix.generator == 'Ninja' && startsWith(matrix.platform, 'macos')
+      if: startsWith(matrix.platform, 'macos')
       shell: bash
       run: brew install ninja
     - name: check environment