diff --git a/lld/COFF/Symbols.h b/lld/COFF/Symbols.h
--- a/lld/COFF/Symbols.h
+++ b/lld/COFF/Symbols.h
@@ -327,8 +327,7 @@
 class DefinedImportData : public Defined {
 public:
   DefinedImportData(StringRef n, ImportFile *f)
-      : Defined(DefinedImportDataKind, n), file(f) {
-  }
+      : Defined(DefinedImportDataKind, n), file(f), loadThunkSym(nullptr) {}
 
   static bool classof(const Symbol *s) {
     return s->kind() == DefinedImportDataKind;