diff --git a/src/dev_arygon.h b/src/dev_arygon.h
index bef3eac..cc70bd4 100644
--- a/src/dev_arygon.h
+++ b/src/dev_arygon.h
@@ -25,7 +25,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>
 #include "types.h"
 
 // Functions used by developer to handle connection to this device
-dev_info* dev_arygon_connect(const nfc_device_desc_t* device_desc);
+dev_info* dev_arygon_connect(const nfc_device_desc_t* pndd);
 void dev_arygon_disconnect(dev_info* pdi);
 
 // Callback function used by libnfc to transmit commands to the PN53X chip
diff --git a/src/libnfc.c b/src/libnfc.c
index 72c0d00..25ba31e 100644
--- a/src/libnfc.c
+++ b/src/libnfc.c
@@ -870,7 +870,7 @@ bool nfc_target_receive_dep_bytes(const dev_info* pdi, byte_t* pbtRx, size_t* ps
 bool nfc_target_receive_bytes(const dev_info* pdi, byte_t* pbtRx, size_t* pszRxLen)
 {
   byte_t abtRx[MAX_FRAME_LEN];
-  uint32_t szRxLen;
+  size_t szRxLen;
 
   // Try to gather a received frame from the reader
   if (!pn53x_transceive(pdi,pncmd_target_receive,2,abtRx,&szRxLen)) return false;