diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f284342..27a4ca8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,7 @@ jobs:
   # 20 cores, 121 GB) builds it natively rather than cross-compiling.
   aarch64:
     name: release build · aarch64 (spark-1)
-    runs-on: [self-hosted, linux, ARM64, spark-1]
+    runs-on: [self-hosted, Linux, ARM64, spark-1]
     if: github.ref == 'refs/heads/main' || github.event_name == 'workflow_dispatch'
     steps:
       - uses: actions/checkout@v5