diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a18abf3e9..900ed50c9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -61,7 +61,7 @@ jobs:
       - name: 'Upload AppImage/linux64'
         env:
           ICESTUDIO_VERSION: "${{steps.icestudio_json.outputs.icestudio_version}}" 
-          TIMESTAMP: "${{steps.build_date.icestudio_timestamp}}"
+          TIMESTAMP: "${{steps.build_date.outputs.icestudio_timestamp}}"
         uses: 'actions/upload-artifact@v3'
         with:
           name: "linux64_AppImage_${{env.ICESTUDIO_VERSION}}${{env.TIMESTAMP}}"
@@ -71,7 +71,7 @@ jobs:
       - name: 'Upload ZIP/linux64'
         env:
           ICESTUDIO_VERSION: "${{steps.icestudio_json.outputs.icestudio_version}}"
-          TIMESTAMP: "${{steps.build_date.icestudio_timestamp}}"
+          TIMESTAMP: "${{steps.build_date.outputs.icestudio_timestamp}}"
         uses: 'actions/upload-artifact@v3'
         with:
           name: "linux64_ZIP_${{env.ICESTUDIO_VERSION}}${{env.TIMESTAMP}}"