diff --git a/.github/workflows/build_viewer.yml b/.github/workflows/build_viewer.yml
index ce86df82c6..4f76b9a085 100644
--- a/.github/workflows/build_viewer.yml
+++ b/.github/workflows/build_viewer.yml
@@ -313,7 +313,7 @@ jobs:
           FS_PF_UA: ${{ secrets.FS_PF_UA }}
         run: |
           if [ -n "${FS_PF_UA}" ]; then
-            echo "EXTRA_ARGS=${{ env.EXTRA_ARGS }} -DFS_PS_USER_AGENT=\"${FS_PF_UA}\"" >> $GITHUB_ENV
+            echo "EXTRA_ARGS=${{ env.EXTRA_ARGS }} -DFS_PF_USER_AGENT=\"${FS_PF_UA}\"" >> $GITHUB_ENV
             echo "Building with custom user-agent string."
           else
             echo "No custom user-agent string provided."