diff --git a/bolt/lib/Core/DebugData.cpp b/bolt/lib/Core/DebugData.cpp
index c96330796014..f0c59fb69523 100644
--- a/bolt/lib/Core/DebugData.cpp
+++ b/bolt/lib/Core/DebugData.cpp
@@ -1593,7 +1593,7 @@ void DwarfLineTable::emit(BinaryContext &BC, MCStreamer &Streamer) {
   // Some versions of GCC output DWARF5 .debug_info, but DWARF4 or lower
   // .debug_line
   if (LineStrSection) {
-    LineStr = MCDwarfLineStr(*BC.Ctx);
+    LineStr.emplace(*BC.Ctx);
     parseAndPopulateDebugLineStr(*LineStrSection, *LineStr, BC, Streamer);
   }