diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 6b8af19..5da8e75 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -54,7 +54,7 @@ jobs:
       date: ${{ inputs.date }}
       script: ci/build_wheel.sh
       # Package is pure Python and only ever requires one build.
-      matrix_filter: 'map(select((.LINUX_VER | test("centos")|not))) | sort_by((.PY_VER | split(".") | map(tonumber))) | .[-1] + {ARCH: "amd64"}'
+      matrix_filter: 'map(select((.LINUX_VER | test("centos")|not))) | sort_by((.PY_VER | split(".") | map(tonumber))) | [.[-1] + {ARCH: "amd64"}']
   wheel-publish:
     needs: wheel-build
     secrets: inherit