Fix Sytest environmental variable evaluation in CI (#15804)

1 files changed, 2 insertions, 2 deletions

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml

index a0d1c24e90..6c22984997 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -399,8 +399,8 @@ jobs:
       env:
         SYTEST_BRANCH: ${{ github.head_ref }}
         POSTGRES: ${{ matrix.job.postgres && 1}}
-        MULTI_POSTGRES: ${{ (matrix.job.postgres == 'multi-postgres') && 1}}
-        ASYNCIO_REACTOR: ${{ (matrix.job.reactor == 'asyncio') && 1 }}
+        MULTI_POSTGRES: ${{ (matrix.job.postgres == 'multi-postgres') || '' }}
+        ASYNCIO_REACTOR: ${{ (matrix.job.reactor == 'asyncio') || '' }}
         WORKERS: ${{ matrix.job.workers && 1 }}
         BLACKLIST: ${{ matrix.job.workers && 'synapse-blacklist-with-workers' }}
         TOP: ${{ github.workspace }}