diff --git a/appveyor.yml b/appveyor.yml
index d6112253..83fa0236 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,10 +7,13 @@ environment:
     matrix:
         - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
           MINICONDA_DIRNAME: C:\Miniconda38-x64
+          CONDA_SHELL: powershell
         - APPVEYOR_BUILD_WORKER_IMAGE: Ubuntu
           OS: Linux
+          CONDA_SHELL: bash
         - APPVEYOR_BUILD_WORKER_IMAGE: macOS
           OS: MacOSX
+          CONDA_SHELL: zsh
 
     ANACONDA_TOKEN:
         secure: $(anaconda_token)
@@ -24,7 +27,7 @@ init:
 install:
     - conda config --set always_yes yes --set changeps1 no
     - conda update -q conda
-    - conda init
+    - conda init $CONDA_SHELL
     - conda env create -f environment.yml
     - conda activate cadquery
     - pip install git+https://github.com/CadQuery/OCP-stubs.git@7.5.1