diff --git a/src/peekfd.c b/src/peekfd.c
index 2c30f25..6d759b9 100644
--- a/src/peekfd.c
+++ b/src/peekfd.c
@@ -199,7 +199,7 @@ int main(int argc, char **argv)
numfds = argc - optind;
fds = malloc(sizeof(int) * numfds);
for (i = 0; i < numfds; i++)
- fds[i] = atoi(argv[optind + i + 1]);
+ fds[i] = atoi(argv[optind + i]);
}
attach(target_pid);