diff --git a/lib/std/Io/File.zig b/lib/std/Io/File.zig
index a83f8e62a2..3f73169085 100644
--- a/lib/std/Io/File.zig
+++ b/lib/std/Io/File.zig
@@ -215,7 +215,7 @@ pub fn openSelfExe(io: Io, flags: OpenFlags) OpenSelfExeError!File {
 
 pub const ReadPositionalError = Reader.Error || error{Unseekable};
 
-pub fn readPositional(file: File, io: Io, buffer: []u8, offset: u64) ReadPositionalError!usize {
+pub fn readPositional(file: File, io: Io, buffer: [][]u8, offset: u64) ReadPositionalError!usize {
     return io.vtable.fileReadPositional(io.userdata, file, buffer, offset);
 }