diff --git a/.github/workflows/sandwich.yml b/.github/workflows/sandwich.yml
index c5fd677c..5a059ee5 100644
--- a/.github/workflows/sandwich.yml
+++ b/.github/workflows/sandwich.yml
@@ -42,15 +42,20 @@ jobs:
         "$env:PGBIN" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
 
         # Disable demo-postgres since it requires unix sockets
-        sed -i 's/demos\/demo-postgres/-- demos\/demo-postgres/g' cabal.project
+        sed -i 's|, ./demos/demo-postgres|-- , ./demos/demo-postgres|g' cabal.project
+        cat cabal.project
 
     # Because the HaskellNet dependency doesn't work yet with GHC 9.8
     - name: Disable demo-fake-smtp-server for GHC 9.8.x
       if: ${{ matrix.ghc == '9.8.2' && runner.os == 'macOS' }}
-      run: sed -i '.bak' 's/demos\/demo-fake-smtp-server/-- demos\/demo-fake-smtp-server/g' cabal.project
+      run: |
+        sed -i '.bak' 's|, ./demos/demo-fake-smtp-server|--, ./demos/demo-fake-smtp-server|g' cabal.project
+        cat cabal.project
     - name: Disable demo-fake-smtp-server for GHC 9.8.x
       if: ${{ matrix.ghc == '9.8.2' && runner.os != 'macOS' }}
-      run: sed -i 's/demos\/demo-fake-smtp-server/-- demos\/demo-fake-smtp-server/g' cabal.project
+      run: |
+        sed -i 's|, ./demos/demo-fake-smtp-server|-- , ./demos/demo-fake-smtp-server|g' cabal.project
+        cat cabal.project
 
     - uses: haskell-actions/setup@v2
       id: setup-haskell-cabal