diff --git a/main/asterisk.c b/main/asterisk.c
index d1b37b575b..4c9aa4a3c1 100644
--- a/main/asterisk.c
+++ b/main/asterisk.c
@@ -1966,6 +1966,7 @@ static int ast_el_read_char(EditLine *el, char *cp)
 				if (*tmp == 127) {
 					memmove(tmp, tmp + 1, strlen(tmp));
 					tmp--;
+					res--;
 				}
 			}