diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index 4839c3470c76..8f1895e0485e 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -35,6 +35,7 @@ MCStreamer::~MCStreamer() {
 void MCStreamer::reset() {
   for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
     delete W64UnwindInfos[i];
+  W64UnwindInfos.clear();
   EmitEHFrame = true;
   EmitDebugFrame = false;
   CurrentW64UnwindInfo = 0;