diff --git a/cli_classic.c b/cli_classic.c
index b79f953..0591bfe 100644
--- a/cli_classic.c
+++ b/cli_classic.c
@@ -383,6 +383,11 @@
 			fprintf(stderr, "Log file not supported in standalone mode. Aborting.\n");
 			cli_classic_abort_usage();
 #else /* STANDALONE */
+			if (logfile) {
+				fprintf(stderr, "Warning: -o/--output specified multiple times.\n");
+				free(logfile);
+			}
+
 			logfile = strdup(optarg);
 			if (logfile[0] == '\0') {
 				fprintf(stderr, "No log filename specified.\n");