diff --git a/clang-tools-extra/clangd/ClangdLSPServer.cpp b/clang-tools-extra/clangd/ClangdLSPServer.cpp
index c30890f147873..8bc49b5a5817c 100644
--- a/clang-tools-extra/clangd/ClangdLSPServer.cpp
+++ b/clang-tools-extra/clangd/ClangdLSPServer.cpp
@@ -582,7 +582,7 @@ void ClangdLSPServer::onInitialize(const InitializeParams &Params,
     bindMethods(Binder);
     if (Opts.Modules)
       for (auto &Mod : *Opts.Modules)
-        Mod.initializeLSP(Binder, Params.capabilities, ServerCaps);
+        Mod.initializeLSP(Binder, Params.rawCapabilities, ServerCaps);
   }
 
   // Per LSP, renameProvider can be either boolean or RenameOptions.
diff --git a/clang-tools-extra/clangd/Module.h b/clang-tools-extra/clangd/Module.h
index 3f5d5f0b29b3e..a99b78d51c444 100644
--- a/clang-tools-extra/clangd/Module.h
+++ b/clang-tools-extra/clangd/Module.h
@@ -2,7 +2,6 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_MODULE_H
 
 #include "LSPBinder.h"
-#include "Protocol.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/JSON.h"
 #include <memory>
@@ -37,9 +36,8 @@ class Module {
   ///
   /// This is only called if the module is running in ClangdLSPServer!
   /// Modules with a public interface should satisfy it without LSP bindings.
-  // FIXME: ClientCaps should be a raw json::Object here.
   virtual void initializeLSP(LSPBinder &Bind,
-                             const ClientCapabilities &ClientCaps,
+                             const llvm::json::Object &ClientCaps,
                              llvm::json::Object &ServerCaps) {}
 };
 
diff --git a/clang-tools-extra/clangd/Protocol.cpp b/clang-tools-extra/clangd/Protocol.cpp
index 74e6b8c72a1c1..525da502b692b 100644
--- a/clang-tools-extra/clangd/Protocol.cpp
+++ b/clang-tools-extra/clangd/Protocol.cpp
@@ -430,6 +430,8 @@ bool fromJSON(const llvm::json::Value &Params, InitializeParams &R,
   O.map("rootUri", R.rootUri);
   O.map("rootPath", R.rootPath);
   O.map("capabilities", R.capabilities);
+  if (auto *RawCaps = Params.getAsObject()->getObject("capabilities"))
+    R.rawCapabilities = *RawCaps;
   O.map("trace", R.trace);
   O.map("initializationOptions", R.initializationOptions);
   return true;
diff --git a/clang-tools-extra/clangd/Protocol.h b/clang-tools-extra/clangd/Protocol.h
index 922e701d77ef5..f918183716d28 100644
--- a/clang-tools-extra/clangd/Protocol.h
+++ b/clang-tools-extra/clangd/Protocol.h
@@ -540,6 +540,8 @@ struct InitializeParams {
 
   /// The capabilities provided by the client (editor or tool)
   ClientCapabilities capabilities;
+  /// The same data as capabilities, but not parsed (to expose to modules).
+  llvm::json::Object rawCapabilities;
 
   /// The initial trace setting. If omitted trace is disabled ('off').
   llvm::Optional<TraceLevel> trace;
diff --git a/clang-tools-extra/clangd/unittests/ClangdLSPServerTests.cpp b/clang-tools-extra/clangd/unittests/ClangdLSPServerTests.cpp
index 240188de0da0f..d8674d601bc88 100644
--- a/clang-tools-extra/clangd/unittests/ClangdLSPServerTests.cpp
+++ b/clang-tools-extra/clangd/unittests/ClangdLSPServerTests.cpp
@@ -223,7 +223,7 @@ TEST_F(LSPTest, CDBConfigIntegration) {
 
 TEST_F(LSPTest, ModulesTest) {
   class MathModule : public Module {
-    void initializeLSP(LSPBinder &Bind, const ClientCapabilities &ClientCaps,
+    void initializeLSP(LSPBinder &Bind, const llvm::json::Object &ClientCaps,
                        llvm::json::Object &ServerCaps) override {
       Bind.notification("add", this, &MathModule::add);
       Bind.method("get", this, &MathModule::get);