diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 6d221d8c011ecf5fdfd35cd91b96fe587ba3281d..fc2ddd8a24ca78ae8f8130eb0fe54177ceef8a81 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -12820,7 +12820,7 @@ const processSpawn = switch (native_os) {
 fn processSpawnUnsupported(userdata: ?*anyopaque, options: process.SpawnOptions) process.SpawnError!process.Child {
     _ = userdata;
     _ = options;
-    return error.Unexpected;
+    return error.OperationUnsupported;
 }
 
 const Spawned = struct {
diff --git a/lib/std/process.zig b/lib/std/process.zig
index f7f0e8c30f29b326bade43a2f8490a2b1e26d4ce..5e4fc267db5eed72bf8005da3fa2fbe31d8a158f 100644
--- a/lib/std/process.zig
+++ b/lib/std/process.zig
@@ -328,6 +328,8 @@ pub const ArgExpansion = enum { expand, no_expand };
 pub const WindowsExtension = enum { bat, cmd, com, exe };
 
 pub const SpawnError = error{
+    /// The operating system does not support creating child processes.
+    OperationUnsupported,
     OutOfMemory,
     /// POSIX-only. `StdIo.ignore` was selected and opening `/dev/null` returned ENODEV.
     NoDevice,