diff --git a/src/lib.zig b/src/lib.zig
index 9d43d4031f233debd7e190c505ec0b88175ab16e..959008e8545b49c7029cad304801d44ead4e62fb 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -76,13 +76,13 @@ pub usingnamespace @import("./AnyReader.zig");
 pub usingnamespace @import("./sum.zig");
 pub usingnamespace @import("./RingBuffer.zig");
 
-pub fn fd_realpath(fd: std.os.fd_t) ![std.fs.MAX_PATH_BYTES:0]u8 {
+pub fn fd_realpath(fd: std.posix.fd_t) ![std.fs.MAX_PATH_BYTES:0]u8 {
     switch (builtin.os.tag) {
         .linux => {
             var buf = std.mem.zeroes([64]u8);
             var res = std.mem.zeroes([std.fs.MAX_PATH_BYTES:0]u8);
             const str = try std.fmt.bufPrint(&buf, "/proc/self/fd/{d}", .{fd});
-            _ = try std.os.readlink(str, &res);
+            _ = try std.posix.readlink(str, &res);
             return res;
         },
         else => @compileError("not implemented!"),