diff --git a/src/clang_tu.cc b/src/clang_tu.cc
index 32be1733..54e04ef0 100644
--- a/src/clang_tu.cc
+++ b/src/clang_tu.cc
@@ -124,9 +124,11 @@ buildCompilerInvocation(const std::string &main, std::vector<const char *> args,
     args.insert(args.begin() + 1, std::begin(arr), std::end(arr));
   }
 
-  IntrusiveRefCntPtr<DiagnosticsEngine> diags(
-      CompilerInstance::createDiagnostics(new DiagnosticOptions,
-                                          new IgnoringDiagConsumer, true));
+  IntrusiveRefCntPtr<DiagnosticsEngine> diags(CompilerInstance::createDiagnostics(
+#if LLVM_VERSION_MAJOR >= 20
+      *vfs,
+#endif
+      new DiagnosticOptions, new IgnoringDiagConsumer, true));
 #if LLVM_VERSION_MAJOR < 12 // llvmorg-12-init-5498-g257b29715bb
   driver::Driver d(args[0], llvm::sys::getDefaultTargetTriple(), *diags, vfs);
 #else
diff --git a/src/indexer.cc b/src/indexer.cc
index b81f1d9f..dff4ae2d 100644
--- a/src/indexer.cc
+++ b/src/indexer.cc
@@ -1312,7 +1312,11 @@ index(SemaManager *manager, WorkingFiles *wfiles, VFS *vfs,
   IndexDiags dc;
   auto clang = std::make_unique<CompilerInstance>(pch);
   clang->setInvocation(std::move(ci));
-  clang->createDiagnostics(&dc, false);
+  clang->createDiagnostics(
+#if LLVM_VERSION_MAJOR >= 20
+      *fs,
+#endif
+      &dc, false);
   clang->getDiagnostics().setIgnoreAllWarnings(true);
   clang->setTarget(TargetInfo::CreateTargetInfo(
       clang->getDiagnostics(), clang->getInvocation().TargetOpts));
diff --git a/src/sema_manager.cc b/src/sema_manager.cc
index bf806e47..59aaed02 100644
--- a/src/sema_manager.cc
+++ b/src/sema_manager.cc
@@ -288,7 +288,11 @@ buildCompilerInstance(Session &session, std::unique_ptr<CompilerInvocation> ci,
 
   auto clang = std::make_unique<CompilerInstance>(session.pch);
   clang->setInvocation(std::move(ci));
-  clang->createDiagnostics(&dc, false);
+  clang->createDiagnostics(
+#if LLVM_VERSION_MAJOR >= 20
+      *fs,
+#endif
+      &dc, false);
   clang->setTarget(TargetInfo::CreateTargetInfo(
       clang->getDiagnostics(), clang->getInvocation().TargetOpts));
   if (!clang->hasTarget())
@@ -368,8 +372,11 @@ void buildPreamble(Session &session, CompilerInvocation &ci,
 #endif
 
   StoreDiags dc(task.path);
-  IntrusiveRefCntPtr<DiagnosticsEngine> de =
-      CompilerInstance::createDiagnostics(&ci.getDiagnosticOpts(), &dc, false);
+  IntrusiveRefCntPtr<DiagnosticsEngine> de = CompilerInstance::createDiagnostics(
+#if LLVM_VERSION_MAJOR >= 20
+      *fs,
+#endif
+      &ci.getDiagnosticOpts(), &dc, false);
   if (oldP) {
     std::lock_guard lock(session.wfiles->mutex);
     for (auto &include : oldP->includes)