diff --git a/ping/ping_common.c b/ping/ping_common.c
index 9149e6e7..fac5ee52 100644
--- a/ping/ping_common.c
+++ b/ping/ping_common.c
@@ -215,7 +215,7 @@ void fill(struct ping_rts *rts, char *patp, unsigned char *packet, size_t packet
 
 	if (ii > 0) {
 		size_t kk;
-		size_t max = packet_size < (size_t)(8 + ii) ? 0 : packet_size - (8 + ii);
+		size_t max = packet_size < (size_t)ii + 8 ? 0 : packet_size - (size_t)ii + 8;
 
 		for (kk = 0; kk <= max; kk += ii)
 			for (jj = 0; jj < ii; ++jj)