diff --git a/clang/lib/Basic/Sanitizers.cpp b/clang/lib/Basic/Sanitizers.cpp
--- a/clang/lib/Basic/Sanitizers.cpp
+++ b/clang/lib/Basic/Sanitizers.cpp
@@ -70,6 +70,7 @@
   case llvm::AsanDtorKind::Invalid:
     return "invalid";
   }
+  return "invalid";
 }
 
 llvm::AsanDtorKind AsanDtorKindFromString(StringRef kindStr) {