diff --git a/src/test/ui/tls.rs b/src/test/ui/tls.rs
index c696318e70f..fbd3413885f 100644
--- a/src/test/ui/tls.rs
+++ b/src/test/ui/tls.rs
@@ -1,4 +1,5 @@
 // run-pass
+// ignore-emscripten no threads support
 // compile-flags: -O
 
 #![feature(thread_local)]