diff --git a/gtsam/base/GenericValue.h b/gtsam/base/GenericValue.h
index 1b59b6c1d..229050448 100644
--- a/gtsam/base/GenericValue.h
+++ b/gtsam/base/GenericValue.h
@@ -187,20 +187,18 @@ public:
       ar & boost::serialization::make_nvp("GenericValue",
               boost::serialization::base_object<Value>(*this));
       ar & boost::serialization::make_nvp("value", value_);
-
-	 // Alignment, see https://eigen.tuxfamily.org/dox/group__TopicStructHavingEigenMembers.html
-	 enum { NeedsToAlign = (sizeof(T) % 16) == 0 };
-
-  public:
-
-	EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF(NeedsToAlign)
 	}
 
+
+  // Alignment, see https://eigen.tuxfamily.org/dox/group__TopicStructHavingEigenMembers.html
+  enum { NeedsToAlign = (sizeof(T) % 16) == 0 };
+public:
+  EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF(NeedsToAlign)
+};
+
 /// use this macro instead of BOOST_CLASS_EXPORT for GenericValues
 #define GTSAM_VALUE_EXPORT(Type) BOOST_CLASS_EXPORT(gtsam::GenericValue<Type>)
 
-};
-
 // traits
 template <typename ValueType>
 struct traits<GenericValue<ValueType> >
diff --git a/gtsam/slam/BetweenFactor.h b/gtsam/slam/BetweenFactor.h
index 7af43e986..89291fac5 100644
--- a/gtsam/slam/BetweenFactor.h
+++ b/gtsam/slam/BetweenFactor.h
@@ -123,8 +123,10 @@ namespace gtsam {
       ar & BOOST_SERIALIZATION_NVP(measured_);
     }
   
-  public:
-	  EIGEN_MAKE_ALIGNED_OPERATOR_NEW
+	  // Alignment, see https://eigen.tuxfamily.org/dox/group__TopicStructHavingEigenMembers.html
+	  enum { NeedsToAlign = (sizeof(VALUE) % 16) == 0 };
+    public:
+      EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF(NeedsToAlign)
   }; // \class BetweenFactor
 
   /// traits
diff --git a/gtsam/slam/PriorFactor.h b/gtsam/slam/PriorFactor.h
index c8ed378d8..3c5c42ccc 100644
--- a/gtsam/slam/PriorFactor.h
+++ b/gtsam/slam/PriorFactor.h
@@ -105,8 +105,10 @@ namespace gtsam {
       ar & BOOST_SERIALIZATION_NVP(prior_);
     }
   
+	// Alignment, see https://eigen.tuxfamily.org/dox/group__TopicStructHavingEigenMembers.html
+	enum { NeedsToAlign = (sizeof(T) % 16) == 0 };
   public:
-	  EIGEN_MAKE_ALIGNED_OPERATOR_NEW
+	EIGEN_MAKE_ALIGNED_OPERATOR_NEW_IF(NeedsToAlign)
   };
 
 } /// namespace gtsam