diff --git a/msed.c b/msed.c
index bdef9d4..bc1f121 100644
--- a/msed.c
+++ b/msed.c
@@ -217,6 +217,8 @@ sed(char *file)
 					free(to);
 					free(flags);
 
+					break;
+				case '\0':
 					break;
 				default:
 					fprintf(stderr, "msed: unknown command: '%c'\n", *e);