diff --git a/.github/workflows/presubmit-tests.yml b/.github/workflows/presubmit-tests.yml
index 17a2118..5562901 100644
--- a/.github/workflows/presubmit-tests.yml
+++ b/.github/workflows/presubmit-tests.yml
@@ -30,7 +30,7 @@ jobs:
       - name: Install toolbox binary
         run: |
           VERSION=$(cat toolbox_version.txt)
-          curl -L -o toolbox https://storage.googleapis.com/genai-toolbox/v$VERSION/linux/amd64/toolbox
+          curl -L -o toolbox "https://storage.googleapis.com/genai-toolbox/v${VERSION}/linux/amd64/toolbox"
           chmod +x toolbox
 
       - name: Install Extension