diff --git a/matlab/dr1.m b/matlab/dr1.m
index 48ae4dd43..dd9e8de3c 100644
--- a/matlab/dr1.m
+++ b/matlab/dr1.m
@@ -210,6 +210,7 @@ function [dr,info,M_,options_,oo_] = dr1(dr,task,M_,options_,oo_)
             jacobia_ = real(jacobia_);
         else
             info(1) = 6;
+            info(2) = sum(sum(imag(jacobia_).^2));
             return
         end
     end