Index: clangd/tool/ClangdMain.cpp
===================================================================
--- clangd/tool/ClangdMain.cpp
+++ clangd/tool/ClangdMain.cpp
@@ -27,11 +27,6 @@
 
 namespace clang {
 namespace clangd {
-// FIXME: remove this option when Dex is cheap enough.
-static llvm::cl::opt<bool>
-    UseDex("use-dex-index",
-           llvm::cl::desc("Use experimental Dex dynamic index."),
-           llvm::cl::init(false), llvm::cl::Hidden);
 
 static llvm::cl::opt<Path> CompileCommandsDir(
     "compile-commands-dir",
@@ -394,7 +389,7 @@
   if (!ResourceDir.empty())
     Opts.ResourceDir = ResourceDir;
   Opts.BuildDynamicSymbolIndex = EnableIndex;
-  Opts.HeavyweightDynamicSymbolIndex = UseDex;
+  Opts.HeavyweightDynamicSymbolIndex = true;
   Opts.BackgroundIndex = EnableBackgroundIndex;
   Opts.BackgroundIndexRebuildPeriodMs = BackgroundIndexRebuildPeriod;
   std::unique_ptr<SymbolIndex> StaticIdx;