diff --git a/lib/std/Thread.zig b/lib/std/Thread.zig
index 73678714d0..4038f755b7 100644
--- a/lib/std/Thread.zig
+++ b/lib/std/Thread.zig
@@ -581,7 +581,7 @@ const LinuxThreadImpl = struct {
             defer tls_ptr = @ptrToInt(&user_desc);
             user_desc = .{
                 .entry_number = os.linux.tls.tls_image.gdt_entry_number,
-                .base_addr = tks_ptr,
+                .base_addr = tls_ptr,
                 .limit = 0xfffff,
                 .seg_32bit = 1,
                 .contents = 0, // Data