diff --git a/clang-tools-extra/clangd/ClangdLSPServer.cpp b/clang-tools-extra/clangd/ClangdLSPServer.cpp
--- a/clang-tools-extra/clangd/ClangdLSPServer.cpp
+++ b/clang-tools-extra/clangd/ClangdLSPServer.cpp
@@ -25,16 +25,6 @@
 namespace clang {
 namespace clangd {
 namespace {
-class IgnoreCompletionError : public llvm::ErrorInfo<CancelledError> {
-public:
-  void log(llvm::raw_ostream &OS) const override {
-    OS << "ignored auto-triggered completion, preceding char did not match";
-  }
-  std::error_code convertToErrorCode() const override {
-    return std::make_error_code(std::errc::operation_canceled);
-  }
-};
-
 /// Transforms a tweak into a code action that would apply it if executed.
 /// EXPECTS: T.prepare() was called and returned true.
 CodeAction toCodeAction(const ClangdServer::TweakRef &T, const URIForFile &File,
@@ -739,7 +729,9 @@
 void ClangdLSPServer::onCompletion(const CompletionParams &Params,
                                    Callback<CompletionList> Reply) {
   if (!shouldRunCompletion(Params))
-    return Reply(llvm::make_error<IgnoreCompletionError>());
+    return Reply(llvm::make_error<LSPError>(
+        "ignored auto-triggered completion, preceding char did not match",
+        ErrorCode::RequestCancelled));
   Server->codeComplete(Params.textDocument.uri.file(), Params.position, CCOpts,
                        Bind(
                            [this](decltype(Reply) Reply,
diff --git a/clang-tools-extra/clangd/test/completion-auto-trigger.test b/clang-tools-extra/clangd/test/completion-auto-trigger.test
--- a/clang-tools-extra/clangd/test/completion-auto-trigger.test
+++ b/clang-tools-extra/clangd/test/completion-auto-trigger.test
@@ -5,7 +5,7 @@
 ---
 {"jsonrpc":"2.0","id":1,"method":"textDocument/completion","params":{"textDocument":{"uri":"test:///main.cpp"},"position":{"line":2,"character":9},"context":{"triggerKind":2,"triggerCharacter":">"}}}
 #      CHECK:  "error": {
-# CHECK-NEXT:    "code": -32001,
+# CHECK-NEXT:    "code": -32800,
 # CHECK-NEXT:    "message": "ignored auto-triggered completion, preceding char did not match"
 # CHECK-NEXT:  },
 # CHECK-NEXT:  "id": 1,
@@ -65,7 +65,7 @@
 ---
 {"jsonrpc":"2.0","id":3,"method":"textDocument/completion","params":{"textDocument":{"uri":"test:///main.cpp"},"position":{"line":5,"character":9},"context":{"triggerKind":2,"triggerCharacter":":"}}}
 #      CHECK:  "error": {
-# CHECK-NEXT:    "code": -32001,
+# CHECK-NEXT:    "code": -32800,
 # CHECK-NEXT:    "message": "ignored auto-triggered completion, preceding char did not match"
 # CHECK-NEXT:  },
 # CHECK-NEXT:  "id": 3,