diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 51d88ff..f9b8bbb 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -115,6 +115,7 @@
 }
 
 MachineFunction::~MachineFunction() { 
+  BasicBlocks.clear();
   delete SSARegMapping;
   delete MFInfo;
   delete FrameInfo;