diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 0e54e9419356c..e171082942f6e 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3667,7 +3667,7 @@ void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
   } else {
     Name = Fn->getName();
 
-    if (const auto *BD = dyn_cast<BlockDecl>(D))
+    if (isa<BlockDecl>(D))
       LinkageName = Name;
 
     Flags |= llvm::DINode::FlagPrototyped;