diff --git a/lld/lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp b/lld/lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp
index b0e5546592bd..4dbb5d70a46f 100644
--- a/lld/lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp
+++ b/lld/lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp
@@ -59,11 +59,6 @@ bool PECOFFLinkingContext::validateImpl(raw_ostream &diagnostics) {
     return true;
   }
 
-  if (_subsystem == llvm::COFF::IMAGE_SUBSYSTEM_UNKNOWN) {
-    diagnostics << "Error: Subsystem is not specified\n";
-    return true;
-  }
-
   _reader = createReaderPECOFF(*this);
   _writer = createWriterPECOFF(*this);
   return false;