diff --git a/lib/CodeGen/AsmPrinter/DwarfAccelTable.h b/lib/CodeGen/AsmPrinter/DwarfAccelTable.h
index c2794c7967f..5d6c847e8b1 100644
--- a/lib/CodeGen/AsmPrinter/DwarfAccelTable.h
+++ b/lib/CodeGen/AsmPrinter/DwarfAccelTable.h
@@ -183,6 +183,7 @@ private:
   struct DataArray {
     MCSymbol *StrSym;
     std::vector<HashDataContents *> Values;
+    DataArray() : StrSym(nullptr), Values() {}
   };
   friend struct HashData;
   struct HashData {