diff --git a/lld/test/MachO/lit.local.cfg b/lld/test/MachO/lit.local.cfg
--- a/lld/test/MachO/lit.local.cfg
+++ b/lld/test/MachO/lit.local.cfg
@@ -19,7 +19,7 @@
 
 # Since most of our tests are written around x86_64, we give this platform the
 # shortest substitution of "%lld".
-lld = ('ld64.lld -arch x86_64 -platform_version macos 10.15 11.0 -syslibroot ' +
+lld = ('ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot ' +
     os.path.join(config.test_source_root, "MachO", "Inputs", "MacOSX.sdk"))
 config.substitutions.append(('%lld', lld + ' -fatal_warnings'))
 config.substitutions.append(('%no-fatal-warnings-lld', lld))