diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 0e5c12504b159b145f9825f9ce264f1efd0860fe..b5d40b5b01be5575332ece3f02dc662c83e31b8f 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -3900,7 +3900,7 @@ fn netAcceptPosix(userdata: ?*anyopaque, listen_fd: net.Socket.Handle) net.Serve
             .BADF => |err| return errnoBug(err), // File descriptor used after closed.
             .CONNABORTED => return error.ConnectionAborted,
             .FAULT => |err| return errnoBug(err),
-            .INVAL => |err| return errnoBug(err),
+            .INVAL => return error.SocketNotListening,
             .NOTSOCK => |err| return errnoBug(err),
             .MFILE => return error.ProcessFdQuotaExceeded,
             .NFILE => return error.SystemFdQuotaExceeded,
diff --git a/lib/std/Io/net.zig b/lib/std/Io/net.zig
index ee1e93ced21d221aeeac9d676fba979dcdc7412e..c9bc65dd3b85b2145ef007824113e7adef4e9b99 100644
--- a/lib/std/Io/net.zig
+++ b/lib/std/Io/net.zig
@@ -1333,6 +1333,10 @@ pub const Server = struct {
         /// Not enough free memory. This often means that the memory allocation is limited
         /// by the socket buffer limits, not by the system memory.
         SystemResources,
+        /// Either `listen` was never called, or `shutdown` was called (possibly while
+        /// this call was blocking). This allows `shutdown` to be used as a concurrent
+        /// cancellation mechanism.
+        SocketNotListening,
         /// The network subsystem has failed.
         NetworkDown,
         /// No connection is already queued and ready to be accepted, and