diff --git a/.github/workflows/ubuntu-main.yml b/.github/workflows/ubuntu-main.yml
index 83e17077..ba529a22 100644
--- a/.github/workflows/ubuntu-main.yml
+++ b/.github/workflows/ubuntu-main.yml
@@ -34,7 +34,7 @@ jobs:
         sudo apt-get install -y doxygen
         echo "::endgroup"
 
-        echo "::group::install sphinx
+        echo "::group::install sphinx"
         sudo apt-get install -y python3-sphinx
         echo "::endgroup"