diff --git a/clang-tools-extra/clangd/Config.h b/clang-tools-extra/clangd/Config.h
--- a/clang-tools-extra/clangd/Config.h
+++ b/clang-tools-extra/clangd/Config.h
@@ -92,9 +92,6 @@
     /// Diagnose missing and unused includes.
     Strict,
     None,
-    /// The same as Strict, but using the include-cleaner library for
-    /// unused includes.
-    Experiment,
   };
   /// Controls warnings and errors when parsing code.
   struct {
diff --git a/clang-tools-extra/clangd/ConfigCompile.cpp b/clang-tools-extra/clangd/ConfigCompile.cpp
--- a/clang-tools-extra/clangd/ConfigCompile.cpp
+++ b/clang-tools-extra/clangd/ConfigCompile.cpp
@@ -434,7 +434,9 @@
       if (auto Val = compileEnum<Config::IncludesPolicy>("UnusedIncludes",
                                                          **F.UnusedIncludes)
                          .map("Strict", Config::IncludesPolicy::Strict)
-                         .map("Experiment", Config::IncludesPolicy::Experiment)
+                         .map("Experiment",
+                              Config::IncludesPolicy::Strict) // for backward
+                                                              // compatibility
                          .map("None", Config::IncludesPolicy::None)
                          .value())
         Out.Apply.push_back([Val](const Params &, Config &C) {
diff --git a/clang-tools-extra/clangd/ConfigFragment.h b/clang-tools-extra/clangd/ConfigFragment.h
--- a/clang-tools-extra/clangd/ConfigFragment.h
+++ b/clang-tools-extra/clangd/ConfigFragment.h
@@ -232,7 +232,6 @@
     ///
     /// Valid values are:
     /// - Strict
-    /// - Experiment
     /// - None
     std::optional<Located<std::string>> UnusedIncludes;
 
diff --git a/clang-tools-extra/clangd/IncludeCleaner.cpp b/clang-tools-extra/clangd/IncludeCleaner.cpp
--- a/clang-tools-extra/clangd/IncludeCleaner.cpp
+++ b/clang-tools-extra/clangd/IncludeCleaner.cpp
@@ -758,17 +758,13 @@
   const Config &Cfg = Config::current();
   IncludeCleanerFindings Findings;
   if (Cfg.Diagnostics.MissingIncludes == Config::IncludesPolicy::Strict ||
-      Cfg.Diagnostics.UnusedIncludes == Config::IncludesPolicy::Experiment) {
+      Cfg.Diagnostics.UnusedIncludes == Config::IncludesPolicy::Strict) {
     // will need include-cleaner results, call it once
     Findings = computeIncludeCleanerFindings(AST);
   }
 
   std::vector<Diag> Result = generateUnusedIncludeDiagnostics(
-      AST.tuPath(),
-      Cfg.Diagnostics.UnusedIncludes == Config::IncludesPolicy::Strict
-          ? computeUnusedIncludes(AST)
-          : Findings.UnusedIncludes,
-      Code);
+      AST.tuPath(), Findings.UnusedIncludes, Code);
   llvm::move(
       generateMissingIncludeDiagnostics(AST, Findings.MissingIncludes, Code),
       std::back_inserter(Result));
diff --git a/clang-tools-extra/clangd/Preamble.cpp b/clang-tools-extra/clangd/Preamble.cpp
--- a/clang-tools-extra/clangd/Preamble.cpp
+++ b/clang-tools-extra/clangd/Preamble.cpp
@@ -128,7 +128,7 @@
     SourceMgr = &CI.getSourceManager();
     Includes.collect(CI);
     if (Config::current().Diagnostics.UnusedIncludes ==
-                Config::IncludesPolicy::Experiment ||
+                Config::IncludesPolicy::Strict ||
             Config::current().Diagnostics.MissingIncludes ==
             Config::IncludesPolicy::Strict)
       Pragmas.record(CI);
diff --git a/clang-tools-extra/clangd/unittests/IncludeCleanerTests.cpp b/clang-tools-extra/clangd/unittests/IncludeCleanerTests.cpp
--- a/clang-tools-extra/clangd/unittests/IncludeCleanerTests.cpp
+++ b/clang-tools-extra/clangd/unittests/IncludeCleanerTests.cpp
@@ -697,7 +697,7 @@
     void foo() {}
   )cpp");
   Config Cfg;
-  Cfg.Diagnostics.UnusedIncludes = Config::IncludesPolicy::Experiment;
+  Cfg.Diagnostics.UnusedIncludes = Config::IncludesPolicy::Strict;
   WithContextValue Ctx(Config::Key, std::move(Cfg));
   ParsedAST AST = TU.build();