parse: Don't allow negative optimization levels

1 files changed, 1 insertions, 1 deletions

diff --git a/parse.c b/parse.c
index 7b10f39..2ba0602 100644
--- a/parse.c
+++ b/parse.c
@@ -760,7 +760,7 @@ static struct expr *parse_optlevel(struct parser_state *state, int arg1, int arg
 
 	if (strcmp(state->argv[0], "-Ofast") == 0) {
 		*optlevel = 4;
-	} else if (!parse_int(state, state->argv[0] + 2, optlevel, IF_INT)) {
+	} else if (!parse_int(state, state->argv[0] + 2, optlevel, IF_INT | IF_UNSIGNED)) {
 		return NULL;
 	}