diff --git a/DataStructures/SharedMemoryVectorWrapper.h b/DataStructures/SharedMemoryVectorWrapper.h
index 906f3e34e..1679efa99 100644
--- a/DataStructures/SharedMemoryVectorWrapper.h
+++ b/DataStructures/SharedMemoryVectorWrapper.h
@@ -45,6 +45,10 @@ public:
         operator++();
         return tmp;
     }
+    ShMemIterator operator+(std::ptrdiff_t diff) {
+        ShMemIterator tmp(p+diff);
+        return tmp;
+    }
     bool operator==(const ShMemIterator& rhs) {
         return p==rhs.p;
     }