diff --git a/mex/sources/estimation/EstimatedParametersDescription.cc b/mex/sources/estimation/EstimatedParametersDescription.cc
index 69d302f821064fdb23d54ed07ad3b30247496257..ff73894cdc7861f4021392b0346a747267a9311a 100644
--- a/mex/sources/estimation/EstimatedParametersDescription.cc
+++ b/mex/sources/estimation/EstimatedParametersDescription.cc
@@ -44,4 +44,5 @@ EstimatedParametersDescription::getNumberOfPeriods() const
       if (r2 > r)
         r = r2;
     }
+  return r;
 }