diff --git a/modules/services/printing/cupsd.nix b/modules/services/printing/cupsd.nix
index b6dff75ed81..a5c0bea2713 100644
--- a/modules/services/printing/cupsd.nix
+++ b/modules/services/printing/cupsd.nix
@@ -224,5 +224,8 @@ in
         </Policy>
       '';
 
+    # Allow CUPS to receive IPP printer announcements via UDP.
+    networking.firewall.allowedUDPPorts = [ 631 ];
+
   };
 }