diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index cd28c22..aa2104e 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -5599,6 +5599,8 @@
   DeclarationName Name = R.getLookupName();
 
   // Emit warning and note.
+  if (getSourceManager().isInSystemMacro(R.getNameLoc()))
+    return;
   Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
   Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
 }