diff --git a/matlab/+pac/+estimate/iterative_ols.m b/matlab/+pac/+estimate/iterative_ols.m
index 7b039e849..adacfcf50 100644
--- a/matlab/+pac/+estimate/iterative_ols.m
+++ b/matlab/+pac/+estimate/iterative_ols.m
@@ -405,6 +405,7 @@ end
 oo_.pac.(pacmodl).equations.(eqtag).ssr = ssr;
 oo_.pac.(pacmodl).equations.(eqtag).residual = r;
 oo_.pac.(pacmodl).equations.(eqtag).estimator = params0_;
+oo_.pac.(pacmodl).equations.(eqtag).parnames = fieldnames(params);
 oo_.pac.(pacmodl).equations.(eqtag).covariance = NaN(length(params0_));
 oo_.pac.(pacmodl).equations.(eqtag).student = NaN(size(params0_));