diff --git a/mesmer/calibrate_mesmer/train_gv.py b/mesmer/calibrate_mesmer/train_gv.py
index 70764954..e91ac14e 100644
--- a/mesmer/calibrate_mesmer/train_gv.py
+++ b/mesmer/calibrate_mesmer/train_gv.py
@@ -189,7 +189,7 @@ def train_gv_AR(params_gv, gv, max_lag, sel_crit):
 
     # median over all scenarios
     AR_order_scen = xr.concat(AR_order_scen, dim="scen")
-    AR_order_sel = int(AR_order.quantile(q=0.5, **{method: "nearest"}).item())
+    AR_order_sel = int(AR_order_scen.quantile(q=0.5, **{method: "nearest"}).item())
 
     # determine the AR params for the selected AR order
     params_scen = list()