diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h
index c3504d549..d69cd36b2 100644
--- a/Eigen/src/Core/util/Memory.h
+++ b/Eigen/src/Core/util/Memory.h
@@ -341,6 +341,12 @@ public:
     {
         ei_aligned_free( p );
     }
+    
+    bool operator!=(const aligned_allocator<T>& other) const
+    { return false; }
+    
+    bool operator==(const aligned_allocator<T>& other) const
+    { return true; }
 };
 
 #endif // EIGEN_MEMORY_H