diff --git a/third_party/llvm-10.0/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/third_party/llvm-10.0/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index 79c1194..8199d5d 100644
--- a/third_party/llvm-10.0/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/third_party/llvm-10.0/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -427,6 +427,7 @@
                                       bool IsKasan) {
   bool IsAndroid = TargetTriple.isAndroid();
   bool IsIOS = TargetTriple.isiOS() || TargetTriple.isWatchOS();
+  bool IsMacOS = TargetTriple.isMacOSX();
   bool IsFreeBSD = TargetTriple.isOSFreeBSD();
   bool IsNetBSD = TargetTriple.isOSNetBSD();
   bool IsPS4CPU = TargetTriple.isPS4CPU();
@@ -503,6 +504,8 @@
       Mapping.Offset = kMIPS64_ShadowOffset64;
     else if (IsIOS)
       Mapping.Offset = kDynamicShadowSentinel;
+    else if (IsMacOS && IsAArch64)
+      Mapping.Offset = kDynamicShadowSentinel;
     else if (IsAArch64)
       Mapping.Offset = kAArch64_ShadowOffset64;
     else