diff --git a/tools/libclang/IndexDecl.cpp b/tools/libclang/IndexDecl.cpp
index c6080df..d2eb402 100644
--- a/tools/libclang/IndexDecl.cpp
+++ b/tools/libclang/IndexDecl.cpp
@@ -243,6 +243,9 @@
 } // anonymous namespace
 
 void IndexingContext::indexDecl(const Decl *D) {
+  if (D->isImplicit() && shouldIgnoreIfImplicit(D))
+    return;
+
   bool Handled = IndexingDeclVisitor(*this).Visit(const_cast<Decl*>(D));
   if (!Handled && isa<DeclContext>(D))
     indexDeclContext(cast<DeclContext>(D));