diff --git a/lib/std/Io.zig b/lib/std/Io.zig
index 980379b72b985fdd5107e522eda9bdbee475caf0..a63a89e4ee020f91a959e62ee91782d120348c6b 100644
--- a/lib/std/Io.zig
+++ b/lib/std/Io.zig
@@ -303,7 +303,7 @@ pub const Operation = union(enum) {
 
 /// Performs one `Operation`.
 pub fn operate(io: Io, operation: *Operation) Cancelable!void {
-    return io.vtable.operate(io.userdata, operation) catch unreachable;
+    return io.vtable.operate(io.userdata, operation);
 }
 
 /// Submits many operations together without waiting for all of them to
diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 2167baa5e48ced7aa41f4f9b6581b0e6e62c1c04..55a4c8aad73c59bb4c19bb4435877d33db033dac 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -2465,7 +2465,7 @@ fn operate(userdata: ?*anyopaque, op: *Io.Operation) Io.Cancelable!void {
         .file_read_streaming => |*o| {
             _ = o.status.unstarted;
             o.status = .{ .result = fileReadStreaming(o.file, o.data) catch |err| switch (err) {
-                error.Canceled => return error.Canceled,
+                error.Canceled => |e| return e,
                 else => |e| e,
             } };
         },