diff --git a/src/ping/core/send.c b/src/ping/core/send.c
index 684bd01..79591cd 100644
--- a/src/ping/core/send.c
+++ b/src/ping/core/send.c
@@ -1,15 +1,20 @@
-#include <string.h>
+#include <stddef.h>
 
 #include "ping/ft_ping_const.h"
 #include "internal/ping/send.h"
 
+/* Forward declarations */
+static inline void fill_payload(uint8_t *payload, size_t payload_len);
+/* -------------------- */
+
 int
 ping_send_one(struct ping_state *state, size_t payload_len)
 {
 	struct timespec	ts;
 	uint8_t			payload[MAX_PACKET_SIZE];
 
-	memset(payload, 0x42, payload_len);
+
+	fill_payload(payload, payload_len);
 	icmp_get_time(&ts);
 	ping_tracker_record_send(state->tracker, state->seq, &ts);
 	return icmp_send_echo(state->handle,
@@ -19,3 +24,10 @@ ping_send_one(struct ping_state *state, size_t payload_len)
 			state->config->ttl,
 			payload, payload_len);
 }
+
+static inline void
+fill_payload(uint8_t *payload, size_t payload_len)
+{
+	for (size_t i = 0; i < payload_len; ++i)
+		payload[i] = (uint8_t)('a' + (i % 26));
+}