diff --git a/src/mod.zig b/src/mod.zig
index caf04021028d20e81107d0cd424beeec12622833..6393c726b8196551d4e2c55ae87bf0453c61e652 100644
--- a/src/mod.zig
+++ b/src/mod.zig
@@ -2,7 +2,7 @@ const std = @import("std");
 const root = @import("root");
 const impl = std.meta.globalOption("tracer_impl", type) orelse none;
 
-var started = false;
+threadlocal var started = false;
 
 pub const none = @import("./none.zig");
 pub const log = @import("./log.zig");