diff --git a/source/maths/NUSpline.cpp b/source/maths/NUSpline.cpp
index 95373502a8..0024f229c1 100644
--- a/source/maths/NUSpline.cpp
+++ b/source/maths/NUSpline.cpp
@@ -1,4 +1,4 @@
-/* Copyright (C) 2015 Wildfire Games.
+/* Copyright (C) 2016 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -49,6 +49,8 @@ RNSpline::RNSpline()
 {
 }
 
+RNSpline::~RNSpline() = default;
+
 // adds node and updates segment length
 void RNSpline::AddNode(const CFixedVector3D& pos)
 {
@@ -154,6 +156,8 @@ CVector3D RNSpline::GetEndVelocity(int index)
 
 /*********************************** S N S **************************************************/
 
+SNSpline::~SNSpline() = default;
+
 void SNSpline::BuildSpline()
 {
 	RNSpline::BuildSpline();
@@ -183,6 +187,8 @@ void SNSpline::Smooth()
 
 /*********************************** T N S **************************************************/
 
+TNSpline::~TNSpline() = default;
+
 // as with RNSpline but use timePeriod in place of actual node spacing
 // ie time period is time from last node to this node
 void TNSpline::AddNode(const CFixedVector3D& pos, const CFixedVector3D& rotation, fixed timePeriod)
diff --git a/source/maths/NUSpline.h b/source/maths/NUSpline.h
index d465b7b344..a9ae383390 100644
--- a/source/maths/NUSpline.h
+++ b/source/maths/NUSpline.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2015 Wildfire Games.
+/* Copyright (C) 2016 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -52,7 +52,7 @@ class RNSpline
 public:
 
 	RNSpline();
-	virtual ~RNSpline() = default;
+	virtual ~RNSpline();
 
 	void AddNode(const CFixedVector3D& pos);
 	void BuildSpline();
@@ -78,7 +78,7 @@ protected:
 class SNSpline : public RNSpline
 {
 public:
-	virtual ~SNSpline() = default;
+	virtual ~SNSpline();
 
 	void BuildSpline();
 	void Smooth();
@@ -91,7 +91,7 @@ public:
 class TNSpline : public SNSpline
 {
 public:
-	virtual ~TNSpline() = default;
+	virtual ~TNSpline();
 
 	void AddNode(const CFixedVector3D& pos, const CFixedVector3D& rotation, fixed timePeriod);
 	void InsertNode(const int index, const CFixedVector3D& pos, const CFixedVector3D& rotation, fixed timePeriod);