diff --git a/preprocessor/DynareBison.yy b/preprocessor/DynareBison.yy
index 0b26fc27b..5033bf1d6 100644
--- a/preprocessor/DynareBison.yy
+++ b/preprocessor/DynareBison.yy
@@ -1161,7 +1161,8 @@ estimated_list : estimated_list estimated_elem
                  { driver.add_estimated_params_element(); }
                ;
 
-estimated_elem : estimated_elem1 COMMA estimated_elem2 ';';
+estimated_elem : estimated_elem1 COMMA estimated_elem2 ';'
+               | estimated_elem1 ';'
 
 estimated_elem1 : STDERR symbol
                   {