diff --git a/librfm95.c b/librfm95.c
index f550e3c..a1a3c15 100644
--- a/librfm95.c
+++ b/librfm95.c
@@ -319,14 +319,14 @@
 
 size_t rfmReadPayload(uint8_t *payload, size_t size) {
     size_t len = regRead(RFM_FIFO);
-    len = min(len, size);
+    size = min(len, size);
 
     // TODO assume and ignore address for now (already filtered anyway)
     regRead(RFM_FIFO);
 
     _rfmSel();
     _rfmTx(RFM_FIFO);
-    for (size_t i = 0; i < len; i++) {
+    for (size_t i = 0; i < size; i++) {
         payload[i] = _rfmTx(RFM_FIFO);
     }
     _rfmDes();
@@ -410,11 +410,11 @@
     regWrite(RFM_LORA_FIFO_ADDR_PTR, regRead(RFM_LORA_FIFO_CURR_ADDR));
 
     size_t len = regRead(RFM_LORA_RX_BYTES_NB);
-    len = min(len, size);
+    size = min(len, size);
 
     _rfmSel();
     _rfmTx(RFM_FIFO);
-    for (size_t i = 0; i < len; i++) {
+    for (size_t i = 0; i < size; i++) {
         payload[i] = _rfmTx(RFM_FIFO);
     }
     _rfmDes();