diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 527e8fda74..57169d13a6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -151,7 +151,7 @@ jobs:
           # even if we don't use these features, just enabling them can cause side effects
           # and it's useful to test that.
           - { name: "20", java_version_numeric: 20, jvm_args: '--enable-preview' }
-          - { name: "21", java_version_numeric: 21, from: 'jdk.java.net', jvm_args: '--enable-preview' }
+          - { name: "21", java_version_numeric: 21, jvm_args: '--enable-preview' }
           - { name: "22-ea", java_version_numeric: 22, from: 'jdk.java.net', jvm_args: '--enable-preview' }
           - { name: "23-ea", java_version_numeric: 23, from: 'jdk.java.net', jvm_args: '--enable-preview' }
     steps: