diff --git a/nixos/lib/qemu-common.nix b/nixos/lib/qemu-common.nix
index a8ed27dd6091..4fff2e0a6f15 100644
--- a/nixos/lib/qemu-common.nix
+++ b/nixos/lib/qemu-common.nix
@@ -19,7 +19,7 @@ rec {
     ];
 
   qemuSerialDevice =
-    if with pkgs.stdenv.hostPlatform; isx86 || isMips64 || isRiscV then "ttyS0"
+    if with pkgs.stdenv.hostPlatform; isx86 || isLoongArch64 || isMips64 || isRiscV then "ttyS0"
     else if (with pkgs.stdenv.hostPlatform; isAarch || isPower) then "ttyAMA0"
     else throw "Unknown QEMU serial device for system '${pkgs.stdenv.hostPlatform.system}'";