diff --git a/test/Concurrency/Backdeploy/mangling.swift b/test/Concurrency/Backdeploy/mangling.swift
index ab5e404c8f6e0..63cd3ea7b16b0 100644
--- a/test/Concurrency/Backdeploy/mangling.swift
+++ b/test/Concurrency/Backdeploy/mangling.swift
@@ -12,6 +12,7 @@
 // RUN: %target-build-swift -target x86_64-apple-macosx10.15 %s -o %t/test_mangling -Xfrontend -disable-availability-checking
 // RUN: %target-run %t/test_mangling
 
+// REQUIRES: CPU=x86_64
 // REQUIRES: OS=macosx
 // REQUIRES: executable_test