diff --git a/src/message_handler.hh b/src/message_handler.hh
index 50d1b5cc..fb194cf0 100644
--- a/src/message_handler.hh
+++ b/src/message_handler.hh
@@ -296,7 +296,7 @@ private:
   void textDocument_signatureHelp(TextDocumentPositionParam &, ReplyOnce &);
   void textDocument_switchSourceHeader(TextDocumentIdentifier &, ReplyOnce &);
   void textDocument_typeDefinition(TextDocumentPositionParam &, ReplyOnce &);
-  void workspace_didChangeConfiguration(EmptyParam &);
+  void workspace_didChangeConfiguration(JsonReader &);
   void workspace_didChangeWatchedFiles(DidChangeWatchedFilesParam &);
   void workspace_didChangeWorkspaceFolders(DidChangeWorkspaceFoldersParam &);
   void workspace_executeCommand(JsonReader &, ReplyOnce &);
diff --git a/src/messages/workspace.cc b/src/messages/workspace.cc
index c9bf85c8..4eb8e7fd 100644
--- a/src/messages/workspace.cc
+++ b/src/messages/workspace.cc
@@ -13,6 +13,9 @@
 #include <llvm/ADT/StringRef.h>
 #include <llvm/Support/Path.h>
 
+#include <rapidjson/document.h>
+#include <rapidjson/writer.h>
+
 #include <algorithm>
 #include <ctype.h>
 #include <functional>
@@ -22,13 +25,31 @@ using namespace llvm;
 namespace ccls {
 REFLECT_STRUCT(SymbolInformation, name, kind, location, containerName);
 
-void MessageHandler::workspace_didChangeConfiguration(EmptyParam &) {
+void MessageHandler::workspace_didChangeConfiguration(JsonReader &reader) {
+  auto it = reader.m->FindMember("settings");
+  if (!(it != reader.m->MemberEnd() && it->value.IsObject()))
+    return;
+
+  // Similar to MessageHandler::initialize.
+  rapidjson::StringBuffer output;
+  rapidjson::Writer<rapidjson::StringBuffer> writer(output);
+  JsonReader m1(&it->value);
+  it->value.Accept(writer);
+  LOG_S(INFO) << "didChangeConfiguration: " << output.GetString();
+  try {
+    reflect(m1, *g_config);
+  } catch (std::invalid_argument &) {
+    reader.path_.push_back("settings");
+    reader.path_.insert(reader.path_.end(), m1.path_.begin(), m1.path_.end());
+    throw;
+  }
+
   for (auto &[folder, _] : g_config->workspaceFolders)
     project->load(folder);
   project->index(wfiles, RequestId());
 
   manager->clear();
-};
+}
 
 void MessageHandler::workspace_didChangeWatchedFiles(DidChangeWatchedFilesParam &param) {
   for (auto &event : param.changes) {