diff --git a/clang-tools-extra/clangd/ClangdServer.h b/clang-tools-extra/clangd/ClangdServer.h
--- a/clang-tools-extra/clangd/ClangdServer.h
+++ b/clang-tools-extra/clangd/ClangdServer.h
@@ -359,9 +359,6 @@
   TUScheduler WorkScheduler;
 };
 
-// FIXME: Remove this compatibility alias.
-using DiagnosticsConsumer = ClangdServer::Callbacks;
-
 } // namespace clangd
 } // namespace clang