diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
index 4df845b..72aa13f 100644
--- a/.github/workflows/haskell.yml
+++ b/.github/workflows/haskell.yml
@@ -75,7 +75,7 @@ jobs:
         ghc-version: ${{ matrix.ghc }}
         enable-stack: true
         stack-version: ${{ (matrix.resolver == 'lts-9' || matrix.resolver == 'lts-11') && '2.15.5' || 'latest' }}
-        stack-no-global: ${{ (matrix.resolver == 'lts-9' || matrix.resolver == 'lts-11') && 'true' || 'false' }}
+        stack-no-global: ${{ (matrix.resolver == 'lts-9' || matrix.resolver == 'lts-11') && 'true' || '' }}
 
     - name: Cache
       id: cache