diff --git a/matlab/+pac/+update/parameters.m b/matlab/+pac/+update/parameters.m
index 655ab97e4a378ab0d0cbdf88f94f3d84525e10e3..05f8cf1e915d3a03594b36d9a4011c3f9bf8c103 100644
--- a/matlab/+pac/+update/parameters.m
+++ b/matlab/+pac/+update/parameters.m
@@ -79,7 +79,7 @@ else
 end
 
 % Makes no sense to have a composite PAC target with a trend component auxiliary model (where all the variables are non stationnary)
-if numberofcomponents>0 && strcmp(M_.pac.pacman.auxiliary_model_type, 'trend_component')
+if numberofcomponents>0 && strcmp(pacmodel.auxiliary_model_type, 'trend_component')
     error('Composite PAC target not allowed with trend component model.')
 end