diff --git a/test/Reflection/typeref_decoding_concurrency.swift b/test/Reflection/typeref_decoding_concurrency.swift
index b54df2f66ab12..53489cbdd111f 100644
--- a/test/Reflection/typeref_decoding_concurrency.swift
+++ b/test/Reflection/typeref_decoding_concurrency.swift
@@ -3,6 +3,7 @@
 // REQUIRES: concurrency
 // REQUIRES: libdispatch
 
+// REQUIRES: CPU=x86_64
 // REQUIRES: OS=macosx
 
 // rdar://76038845