diff --git a/docs/source/conf.py b/docs/source/conf.py
index 1e1c91d732..dab4e79d13 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -147,7 +147,7 @@ def setup(app):
 linkcheck_ignore = [
     R"https://www.raspberrypi.com/software/",
     R"http://10\..+",
-    R"https://gnu.org/",
+    R"https://www.gnu.org/",
 ]
 
 token = os.environ.get("GITHUB_TOKEN", None)