diff --git a/.github/workflows/test-with-manual-install.yml b/.github/workflows/test-with-manual-install.yml
index 1516e3fe8..8e8aa1132 100644
--- a/.github/workflows/test-with-manual-install.yml
+++ b/.github/workflows/test-with-manual-install.yml
@@ -21,12 +21,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
-        include:
-        - os: macos-latest
-          PLATFORM: MacOSX-x86_64
-        - os: ubuntu-latest
-          PLATFORM: Linux-x86_64
+        os: [ubuntu-latest]
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
@@ -45,20 +40,12 @@ jobs:
     - name: Install miniconda
       shell: bash -l {0}
       run: |
-        source setup/setup_conda.sh ${{ matrix.PLATFORM }}
+        source setup/setup_conda.sh Linux-x86_64
 
     - name: Check whether the CI environment variable is set
       shell: bash -l {0}
       run: |
         source setup/activate_conda.sh
-        if [ ${{ matrix.PLATFORM }} == "Linux-x86_64" ]; then
-            echo "Linux install, going to check conda path"
-            which conda
-        else
-            echo "OSX install, skipping conda path check"
-            echo "    since 'which conda' inexplicably returns with status code 1"
-            echo "    only in the CI environment"
-        fi
         echo $CI
 
     - name: Setup the emission environment for testing