diff --git a/lib/std/io/Reader.zig b/lib/std/io/Reader.zig
index b9071be378..9a518cdc33 100644
--- a/lib/std/io/Reader.zig
+++ b/lib/std/io/Reader.zig
@@ -313,9 +313,8 @@ pub fn readVecLimit(r: *Reader, data: []const []u8, limit: Limit) Error!usize {
                 .last = r.buffer,
             },
             .writer = .{
-                .context = &Writer.VectorWrapper.unique_address,
                 .buffer = if (first.len >= r.buffer.len) first else r.buffer,
-                .vtable = &.{ .drain = Writer.fixedDrain },
+                .vtable = &Writer.VectorWrapper.vtable,
             },
         };
         var n = r.vtable.stream(r, &wrapper.writer, .limited(remaining)) catch |err| switch (err) {
@@ -591,9 +590,8 @@ pub fn readSliceShort(r: *Reader, buffer: []u8) ShortError!usize {
                 .last = r.buffer,
             },
             .writer = .{
-                .context = &Writer.VectorWrapper.unique_address,
                 .buffer = if (remaining.len >= r.buffer.len) remaining else r.buffer,
-                .vtable = &.{ .drain = Writer.fixedDrain },
+                .vtable = &Writer.VectorWrapper.vtable,
             },
         };
         const n = r.vtable.stream(r, &wrapper.writer, .unlimited) catch |err| switch (err) {
diff --git a/lib/std/io/Writer.zig b/lib/std/io/Writer.zig
index 309829ae7b..fd3670707c 100644
--- a/lib/std/io/Writer.zig
+++ b/lib/std/io/Writer.zig
@@ -333,11 +333,11 @@ pub const WritableVectorIterator = struct {
 pub const VectorWrapper = struct {
     writer: Writer,
     it: WritableVectorIterator,
-    pub var unique_address: u8 = undefined;
+    pub const vtable: VTable = .{ .drain = fixedDrain };
 };
 
 pub fn writableVectorIterator(w: *Writer) Error!WritableVectorIterator {
-    if (@as(*u8, @ptrCast(w.context)) == &VectorWrapper.unique_address) {
+    if (w.vtable == &VectorWrapper.vtable) {
         const wrapper: *VectorWrapper = @fieldParentPtr("writer", w);
         return wrapper.it;
     }