diff --git a/DataStructures/SharedMemoryVectorWrapper.h b/DataStructures/SharedMemoryVectorWrapper.h
index d089964c7..4524fa6c0 100644
--- a/DataStructures/SharedMemoryVectorWrapper.h
+++ b/DataStructures/SharedMemoryVectorWrapper.h
@@ -75,6 +75,7 @@ private:
 
 public:
     SharedMemoryWrapper() :
+        m_ptr(NULL),
         m_size(0)
     { }