diff --git a/.github/workflows/testsuite.yml b/.github/workflows/testsuite.yml
index a98f86dcc20d..d508cd92c9b1 100644
--- a/.github/workflows/testsuite.yml
+++ b/.github/workflows/testsuite.yml
@@ -812,7 +812,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ "ubuntu-latest". "windows-latest" ]
+        os: [ "ubuntu-latest", "windows-latest" ]
         perl-version:
           - '5.38'
           - '5.24'