diff --git a/include/J3ML/Geometry/Common.h b/include/J3ML/Geometry/Common.h
index 9a63c0a..f25b4e9 100644
--- a/include/J3ML/Geometry/Common.h
+++ b/include/J3ML/Geometry/Common.h
@@ -14,7 +14,7 @@ namespace J3ML::Geometry
     class Plane;
     class Polygon;
     class Polyhedron;
-    template<typename T>class QuadTree;
+    template<typename T> class QuadTree;
     class Ray;
     class Shape;
     class Sphere;