diff --git a/DynareBison.yy b/DynareBison.yy
index 26a727e25616c7b62dedb527c7a6f31e1b005021..6dc6706cfe4b258437d704726c9e7079eeed1c36 100644
--- a/DynareBison.yy
+++ b/DynareBison.yy
@@ -716,6 +716,8 @@ restriction_expression_1 : restriction_elem_expression
 
 restriction_elem_expression : COEFF '(' symbol COMMA INT_NUMBER ')'
                                  { driver.add_positive_restriction_element($3,$5);}
+                            | PLUS COEFF '(' symbol COMMA INT_NUMBER ')'
+		                 { driver.add_positive_restriction_element($4,$6);}
                             | MINUS COEFF '(' symbol COMMA INT_NUMBER ')'
 		                 { driver.add_negative_restriction_element($4,$6);}
                             | expression TIMES COEFF '(' symbol COMMA INT_NUMBER ')'