diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index ea424bb..719474d 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -1272,7 +1272,7 @@
           << Module->Name << Locked.getErrorMessage();
       // Clear out any potential leftover.
       Locked.unsafeRemoveLockFile();
-      // FALLTHROUGH
+      LLVM_FALLTHROUGH;
     case llvm::LockFileManager::LFS_Owned:
       // We're responsible for building the module ourselves.
       if (!compileModuleImpl(ImportingInstance, ModuleNameLoc, Module,