1 files changed, 1 insertions, 1 deletions
diff --git a/ifpps.c b/ifpps.c
index 5bf0d8e..dd03830 100644
--- a/ifpps.c
+++ b/ifpps.c
@@ -1042,7 +1042,7 @@ int main(int argc, char **argv)
 			ifname = xstrndup(optarg, IFNAMSIZ);
 			break;
 		case 't':
-			interval = strtol(optarg, NULL, 10);
+			interval = strtoul(optarg, NULL, 10);
 			break;
 		case 'l':
 			stats_loop = 1;