diff --git a/libnfc/nfc-emulation.c b/libnfc/nfc-emulation.c
index 662e71c..132d08c 100644
--- a/libnfc/nfc-emulation.c
+++ b/libnfc/nfc-emulation.c
@@ -40,7 +40,7 @@ nfc_emulate_target (nfc_device *pnd, struct nfc_emulator *emulator)
   }
 
   while (res >= 0) {
-    res = emulator->state_machine->io (emulator, abtRx, (size_t) szRx, abtTx, sizeof (abtTx));
+    res = emulator->state_machine->io (emulator, abtRx, sizeof(abtRx), abtTx, sizeof (abtTx));
     if (res > 0) {
       if (nfc_target_send_bytes(pnd, abtTx, res, 0) < 0) {
         return -1;