diff --git a/.github/workflows/sub_buildWindowsConda.yml b/.github/workflows/sub_buildWindowsConda.yml
index 73e9b71145..8acb274bcd 100644
--- a/.github/workflows/sub_buildWindowsConda.yml
+++ b/.github/workflows/sub_buildWindowsConda.yml
@@ -79,7 +79,7 @@ jobs:
           CONDA_VERBOSITY: 2
         run: |
           conda config --add envs_dirs $PWD/.conda
-          mamba-devenv -f conda/environment.devenv.yml
+          mamba-devenv --no-prune -f conda/environment.devenv.yml
       - name: Make needed directories, files and initializations
         id: Init
         run: |