diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
@@ -607,8 +607,45 @@
   return result;
 }
 
+struct os_system_version {
+  unsigned int major;
+  unsigned int minor;
+  unsigned int patch;
+};
+
+// Available from macOS 10.12
+extern "C" SANITIZER_WEAK_ATTRIBUTE
+int os_system_version_get_current_version(os_system_version *vers);
+
+#if TARGET_OS_OSX
+// Format: 10.<major>.<minor>
+# define MACOS_ALIGNED_VERSION(vers) vers.minor
+#else
+// Format: <major>.<minor>.<patch>
+# define MACOS_ALIGNED_VERSION(vers) (vers.major - MACOS_VERSION_OFFSET)
+# if TARGET_OS_IOS || TARGET_OS_TV
+#  define MACOS_VERSION_OFFSET 2
+# elif TARGET_OS_WATCH
+#  define MACOS_VERSION_OFFSET 9
+# else
+#  error "Unsupported platform"
+# endif
+#endif
+
 static MacosVersion GetMacosAlignedVersionInternal() {
-  u16 macos_major = GetDarwinKernelVersion().major - 4;
+  if (!os_system_version_get_current_version) {
+    // Approximate OS version by querying the kernel version.  This is not
+    // correct when executing inside the simulators if the simulator runtime is
+    // not aligned with the host macOS version.
+    u16 macos_major = GetDarwinKernelVersion().major - 4;
+    return MacosVersion(10, macos_major);
+  }
+
+  os_system_version os_version;
+  int res = os_system_version_get_current_version(&os_version);
+  CHECK_EQ(res, 0);
+
+  u16 macos_major = MACOS_ALIGNED_VERSION(os_version);
   return MacosVersion(10, macos_major);
 }