diff --git a/lib/sl/sl.c b/lib/sl/sl.c
index 3ccb46f02..a12876116 100644
--- a/lib/sl/sl.c
+++ b/lib/sl/sl.c
@@ -202,10 +202,12 @@ sl_loop (SL_cmd *cmds, char *prompt)
 	    fprintf(stderr, "sl_loop: out of memory\n");
 	    return -1;
 	}
-	ret = sl_command(cmds, argc, argv);
-	if(ret == -1) {
-	    printf ("Unrecognized command: %s\n", argv[0]);
-	    ret = 0;
+	if(argc >= 2) {
+	    ret = sl_command(cmds, argc, argv);
+	    if(ret == -1) {
+		printf ("Unrecognized command: %s\n", argv[0]);
+		ret = 0;
+	    }
 	}
 	free(argv);
 	free(buf);