diff --git a/clang-tools-extra/clangd/DumpAST.h b/clang-tools-extra/clangd/DumpAST.h
index 424025aeca79..c72fe59179fd 100644
--- a/clang-tools-extra/clangd/DumpAST.h
+++ b/clang-tools-extra/clangd/DumpAST.h
@@ -34,6 +34,7 @@
 #include "clang/AST/ASTContext.h"
 
 namespace clang {
+class DynTypedNode;
 namespace syntax {
 class TokenBuffer;
 } // namespace syntax