diff --git a/include/llvm/PassRegistry.h b/include/llvm/PassRegistry.h
index 1fb11ed64c1..809dba0bc0d 100644
--- a/include/llvm/PassRegistry.h
+++ b/include/llvm/PassRegistry.h
@@ -36,6 +36,8 @@ class PassRegistry {
   void *getImpl() const;
    
 public:
+  PassRegistry() : pImpl(0) { }
+  
   /// getPassRegistry - Access the global registry object, which is 
   /// automatically initialized at application launch and destroyed by
   /// llvm_shutdown.