diff --git a/.gitea/workflows/demo.yaml b/.gitea/workflows/demo.yaml
index e78d7a388..d76d49014 100644
--- a/.gitea/workflows/demo.yaml
+++ b/.gitea/workflows/demo.yaml
@@ -27,7 +27,7 @@ jobs:
         run: |
           apt-get -qq update && DEBIAN_FRONTEND=noninteractive apt-get -qq install -y wget software-properties-common && \
 
-          wget https://developer.download.nvidia.com/compute/cuda/repos/${OS}/x86_64/cuda-$OS.pin && \
+          wget https://developer.download.nvidia.com/compute/cuda/repos/$OS/x86_64/cuda-$OS.pin && \
           mv cuda-$OS.pin /etc/apt/preferences.d/cuda-repository-pin-600 && \
           apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/$OS/x86_64/7fa2af80.pub && \
           apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/$OS/x86_64/3bf863cc.pub && \