diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
index 4ddc6d106a9272..1b12285bc63605 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
@@ -558,8 +558,8 @@ MacosVersion GetMacosVersionInternal() {
       if (minor >= 5)
         return MACOS_VERSION_HIGH_SIERRA_DOT_RELEASE_4;
       return MACOS_VERSION_HIGH_SIERRA;
-    case 18:
-      return MACOS_VERSION_MOJAVE;
+    case 18: return MACOS_VERSION_MOJAVE;
+    case 19: return MACOS_VERSION_CATALINA;
     default:
       if (major < 9) return MACOS_VERSION_UNKNOWN;
       return MACOS_VERSION_UNKNOWN_NEWER;
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.h b/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
index 7ba394fb7939ea..2257883084ea9a 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
@@ -44,6 +44,7 @@ enum MacosVersion {
   MACOS_VERSION_HIGH_SIERRA,
   MACOS_VERSION_HIGH_SIERRA_DOT_RELEASE_4,
   MACOS_VERSION_MOJAVE,
+  MACOS_VERSION_CATALINA,
   MACOS_VERSION_UNKNOWN_NEWER
 };