diff --git a/src/message_handler.cc b/src/message_handler.cc
index 69a2a3ca..88c22c31 100644
--- a/src/message_handler.cc
+++ b/src/message_handler.cc
@@ -32,7 +32,7 @@ MAKE_HASHABLE(ccls::SymbolIdx, t.usr, t.kind);
 namespace ccls {
 MAKE_REFLECT_STRUCT(CodeActionParam::Context, diagnostics);
 MAKE_REFLECT_STRUCT(CodeActionParam, textDocument, range, context);
-MAKE_REFLECT_STRUCT(EmptyParam, placeholder);
+void Reflect(Reader &, EmptyParam &) {}
 MAKE_REFLECT_STRUCT(TextDocumentParam, textDocument);
 MAKE_REFLECT_STRUCT(DidOpenTextDocumentParam, textDocument);
 MAKE_REFLECT_STRUCT(TextDocumentContentChangeEvent, range, rangeLength, text);
diff --git a/src/message_handler.hh b/src/message_handler.hh
index e5e07844..8eca9375 100644
--- a/src/message_handler.hh
+++ b/src/message_handler.hh
@@ -43,9 +43,7 @@ struct CodeActionParam {
     std::vector<Diagnostic> diagnostics;
   } context;
 };
-struct EmptyParam {
-  bool placeholder;
-};
+struct EmptyParam {};
 struct DidOpenTextDocumentParam {
   TextDocumentItem textDocument;
 };