diff --git a/.github/workflows/prebuild-legion.yml b/.github/workflows/prebuild-legion.yml
index 00e7e78a77..1cf0ea2dd8 100644
--- a/.github/workflows/prebuild-legion.yml
+++ b/.github/workflows/prebuild-legion.yml
@@ -24,7 +24,7 @@ jobs:
       matrix:
         gpu_backend: ["cuda", "hip_rocm"]
         gpu_backend_version: ["11.8", "5.6"]
-        python_version: "3.11"
+        python_version: ["3.11"]
         exclude:
           - gpu_backend: "cuda"
             gpu_backend_version: "5.6"