diff --git a/rfm69.c b/rfm69.c
index b20aa9a..658289f 100644
--- a/rfm69.c
+++ b/rfm69.c
@@ -251,7 +251,7 @@
     transmit(FIFO | 0x80);
     transmit(len);
     transmit(NODE_ADDRESS);
-    for (size_t i = 0; i < len; i++) {
+    for (size_t i = 0; i < size; i++) {
         transmit(payload[i]);
     }
     spiDes();