diff --git a/matlab/ols/dyn_ols.m b/matlab/ols/dyn_ols.m
index 2f5a9379a..0e23b3346 100644
--- a/matlab/ols/dyn_ols.m
+++ b/matlab/ols/dyn_ols.m
@@ -155,6 +155,8 @@ for i = 1:length(ast)
                     Xtmp = Xtmp.remove(Xtmp.name{j});
                 end
             end
+        else
+            ols_error('didn''t expect to arrive here', jsonmodel{i}.line);
         end
         if ~isempty(Xtmp)
             to_remove = [];