diff --git a/lld/COFF/Driver.h b/lld/COFF/Driver.h
index 162517340e80b..955ec200da7dc 100644
--- a/lld/COFF/Driver.h
+++ b/lld/COFF/Driver.h
@@ -159,7 +159,7 @@ class LinkerDriver {
   std::vector<StringRef> filePaths;
   std::vector<MemoryBufferRef> resources;
 
-  llvm::StringSet<> directivesExports;
+  llvm::DenseSet<StringRef> directivesExports;
 
   COFFLinkerContext &ctx;