diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index d0d83f90021..85df78b2182 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -57,7 +57,7 @@ jobs:
       matrix:
         os:
           - centos7
-        #  - ubuntu2004
+          - ubuntu2004
         compiler:
           - gcc-9.3
           - clang-10