diff --git a/clang/include/clang/AST/ASTContext.h b/clang/include/clang/AST/ASTContext.h
index c5946b662cb294..ed35e73ce4cf90 100644
--- a/clang/include/clang/AST/ASTContext.h
+++ b/clang/include/clang/AST/ASTContext.h
@@ -99,7 +99,6 @@ class CXXMethodDecl;
 class CXXRecordDecl;
 class DiagnosticsEngine;
 class ParentMapContext;
-class DynTypedNode;
 class DynTypedNodeList;
 class Expr;
 enum class FloatModeKind;
diff --git a/clang/include/clang/Tooling/ASTDiff/ASTDiffInternal.h b/clang/include/clang/Tooling/ASTDiff/ASTDiffInternal.h
index fb7bd4e8afa23f..b74af5e8f24f5b 100644
--- a/clang/include/clang/Tooling/ASTDiff/ASTDiffInternal.h
+++ b/clang/include/clang/Tooling/ASTDiff/ASTDiffInternal.h
@@ -17,9 +17,6 @@ namespace diff {
 
 using DynTypedNode = DynTypedNode;
 
-class SyntaxTree;
-struct ComparisonOptions;
-
 /// Within a tree, this identifies a node by its preorder offset.
 struct NodeId {
 private: