1 files changed, 1 insertions, 1 deletions
diff --git a/src/expand.c b/src/expand.c
index 1ab5757..adcb70e 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -927,7 +927,7 @@ numvar:
 	case '-':
 		p = makestrspace(NOPTS, expdest);
 		for (i = NOPTS - 1; i >= 0; i--) {
-			if (optlist[i]) {
+			if (optlist[i] && optletters[i]) {
 				USTPUTC(optletters[i], p);
 				len++;
 			}