diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h
index 1b377b1d9..e25df0049 100644
--- a/Eigen/src/Core/util/Memory.h
+++ b/Eigen/src/Core/util/Memory.h
@@ -336,6 +336,12 @@ 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