diff --git a/test/IRGen/osx-targets.swift b/test/IRGen/osx-targets.swift
index 32d0f9e9cf2c9..deb62e65ff4c3 100644
--- a/test/IRGen/osx-targets.swift
+++ b/test/IRGen/osx-targets.swift
@@ -1,6 +1,8 @@
 // RUN: %swift %s -emit-ir | %FileCheck %s
 // RUN: %swift -target x86_64-apple-macosx10.51 %s -emit-ir | %FileCheck -check-prefix=CHECK-SPECIFIC %s
-// RUN: %swift -target x86_64-apple-darwin55 %s -emit-ir | %FileCheck -check-prefix=CHECK-SPECIFIC %s
+
+// disable this test until macOS 11 support lands in Swift.
+// : %swift -target x86_64-apple-darwin55 %s -emit-ir | %FileCheck -check-prefix=CHECK-SPECIFIC %s
 
 // REQUIRES: OS=macosx