diff --git a/source/blender/freestyle/intern/geometry/VecMat.h b/source/blender/freestyle/intern/geometry/VecMat.h
index c3aae0601fe..3c3d40875d0 100644
--- a/source/blender/freestyle/intern/geometry/VecMat.h
+++ b/source/blender/freestyle/intern/geometry/VecMat.h
@@ -704,7 +704,8 @@ public:
 			for (unsigned int j = 0; j < N; j++)
 				res(j, i) = this->_coord[i * N + j];
 		}
-		return res;
+		*this = res;
+		return *this;
 	}
 
 	template <class U>