diff --git a/src/DynareBison.yy b/src/DynareBison.yy
index c74bc0cc94e61cc4d2eb94ef19b95e3fe140e760..5453d10aada12ddaac404ecf1ed61e5176861630 100644
--- a/src/DynareBison.yy
+++ b/src/DynareBison.yy
@@ -1820,7 +1820,7 @@ subsamples_eq : subsamples_eq_opt EQUAL subsamples_eq_opt ';'
 
 subsamples_eq_opt : symbol '.' SUBSAMPLES
                     { $$ = make_pair($1, ""); }
-                  | STD '(' symbol ')' '.'SUBSAMPLES
+                  | STD '(' symbol ')' '.' SUBSAMPLES
                     { $$ = make_pair($3, ""); }
                   | CORR '(' symbol COMMA symbol ')' '.' SUBSAMPLES
                     { $$ = make_pair($3, $5); }