diff --git a/+af_tools/@Polar/Polar.m b/+af_tools/@Polar/Polar.m
index 8f47b38c3bb4db8521863bc66888679f3ec8082d..3925cf9648850a4cd921d67b1e5eaa740f5555de 100644
--- a/+af_tools/@Polar/Polar.m
+++ b/+af_tools/@Polar/Polar.m
@@ -1,4 +1,4 @@
-classdef Polar
+classdef Polar < handle
     % POLAR Airfoil polars and some associated properties.
     %   The Polar class is used to store an airfoil polars (cl, cd, cm values for different angles
     %   of attacks, at different Reynolds and Mach numbers).