diff --git a/include/blah/numerics/spatial.h b/include/blah/numerics/spatial.h
index e9b6b8b..a5bfd8b 100644
--- a/include/blah/numerics/spatial.h
+++ b/include/blah/numerics/spatial.h
@@ -555,6 +555,10 @@ namespace Blah
 		return Vec2(std::fmax(a.x, b.x), std::fmax(a.y, b.y));
 	}
 
+	template<class T>
+	constexpr Vec3<T>::Vec3()
+		: x(0), y(0), z(0) {}
+
 	template<class T>
 	template<class X, class Y, class Z>
 	constexpr Vec3<T>::Vec3(X x, Y y, Z z)
@@ -598,6 +602,10 @@ namespace Blah
 			a.x * b.y - a.y * b.x);
 	}
 
+	template<class T>
+	constexpr Vec4<T>::Vec4()
+		: x(0), y(0), z(0), w(0) {}
+
 	template<class T>
 	template<class X, class Y, class Z, class W>
 	constexpr Vec4<T>::Vec4(X x, Y y, Z z, W w)