diff --git a/lld/ELF/Symbols.h b/lld/ELF/Symbols.h
index 856767a102d9..1acaae432b4b 100644
--- a/lld/ELF/Symbols.h
+++ b/lld/ELF/Symbols.h
@@ -230,7 +230,7 @@ public:
 
   // If non-null the symbol has a Thunk that may be used as an alternative
   // destination for callers of this Symbol.
-  Thunk<ELFT> *ThunkData;
+  Thunk<ELFT> *ThunkData = nullptr;
 
 private:
   static InputSectionBase<ELFT> *NullInputSection;