diff --git a/.github/workflows/preview_ci.yml b/.github/workflows/preview_ci.yml
index 17fdc6f4f19..0e587558122 100644
--- a/.github/workflows/preview_ci.yml
+++ b/.github/workflows/preview_ci.yml
@@ -27,7 +27,7 @@ jobs:
         dotnet-version: '8.0.x'
     - name: Set build number 
       if: matrix.os == 'ubuntu-latest'
-      run: echo "BuildNumber=eoc_$(( $GITHUB_RUN_NUMBER + 16368 ))" >> $GITHUB_ENV
+      run: echo "BuildNumber=$(( $GITHUB_RUN_NUMBER + 16368 ))" >> $GITHUB_ENV
     - name: Build
       run: |
         dotnet build -c Release