diff --git a/src/pty.zig b/src/pty.zig
index b245b40..fa4db71 100644
--- a/src/pty.zig
+++ b/src/pty.zig
@@ -18,12 +18,11 @@ pub const Tio = switch (builtin.os.tag) {
         pub const IOCSWINSZ: c_ulong = 0x80087467;
         pub const IOCSCTTY: c_ulong = 0x20007461;
     },
-    .linux => struct {
-        pub const IOCGWINSZ: c_ulong = std.os.linux.T.IOCGWINSZ;
-        pub const IOCSWINSZ: c_ulong = std.os.linux.T.IOCSWINSZ;
-        pub const IOCSCTTY: c_ulong = std.os.linux.T.IOCSCTTY;
+    else => struct {
+        pub const IOCGWINSZ: c_ulong = std.c.T.IOCGWINSZ;
+        pub const IOCSWINSZ: c_ulong = std.c.T.IOCSWINSZ;
+        pub const IOCSCTTY: c_ulong = std.c.T.IOCSCTTY;
     },
-    else => @compileError("unsupported OS"),
 };
 
 pub const Winsize = std.posix.winsize;
diff --git a/test/integration.zig b/test/integration.zig
index 5eee342..e1df836 100644
--- a/test/integration.zig
+++ b/test/integration.zig
@@ -25,11 +25,10 @@ const Tio = switch (@import("builtin").os.tag) {
         const IOCSWINSZ: c_ulong = 0x80087467;
         const IOCSCTTY: c_ulong = 0x20007461;
     },
-    .linux => struct {
-        const IOCSWINSZ: c_ulong = std.os.linux.T.IOCSWINSZ;
-        const IOCSCTTY: c_ulong = std.os.linux.T.IOCSCTTY;
+    else => struct {
+        const IOCSWINSZ: c_ulong = std.c.T.IOCSWINSZ;
+        const IOCSCTTY: c_ulong = std.c.T.IOCSCTTY;
     },
-    else => @compileError("unsupported OS"),
 };
 
 /// Per-test environment: an isolated socket directory under /tmp (kept