diff --git a/net/dnsdist/patches/020-gcc11.patch b/net/dnsdist/patches/020-gcc11.patch
new file mode 100644
index 000000000..485beabea
--- /dev/null
+++ b/net/dnsdist/patches/020-gcc11.patch
@@ -0,0 +1,10 @@
+--- a/lock.hh
++++ b/lock.hh
+@@ -20,6 +20,7 @@
+  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+  */
+ #pragma once
++#include <mutex>
+ #include <shared_mutex>
+ 
+ class ReadWriteLock