diff --git a/include/llvm/CodeGen/GlobalISel/GISelWorkList.h b/include/llvm/CodeGen/GlobalISel/GISelWorkList.h
index 227b0a2..626a666 100644
--- a/include/llvm/CodeGen/GlobalISel/GISelWorkList.h
+++ b/include/llvm/CodeGen/GlobalISel/GISelWorkList.h
@@ -33,7 +33,7 @@
   DenseMap<MachineInstr *, unsigned> WorklistMap;
 
 public:
-  GISelWorkList() {}
+  GISelWorkList() : WorklistMap(N) {}
 
   bool empty() const { return WorklistMap.empty(); }