diff --git a/libnfc/drivers/acr122.c b/libnfc/drivers/acr122.c
index 66fbd62..93bc025 100644
--- a/libnfc/drivers/acr122.c
+++ b/libnfc/drivers/acr122.c
@@ -354,6 +354,7 @@ acr122_receive (nfc_device_t * pnd, byte_t * pbtData, const size_t szData)
   memcpy (pbtData, DRIVER_DATA (pnd)->abtRx + 2, len);
 
   // Transmission went successful
+  pnd->iLastError = 0;
   return len;
 }
 
diff --git a/libnfc/drivers/pn53x_usb.c b/libnfc/drivers/pn53x_usb.c
index 7b4c7ce..6bf4ccf 100644
--- a/libnfc/drivers/pn53x_usb.c
+++ b/libnfc/drivers/pn53x_usb.c
@@ -443,7 +443,7 @@ read:
     pnd->iLastError = DEIO;
     // try to interrupt current device state
     pn53x_usb_ack(pnd);
-    return false;
+    return -1;
   }
 
   const byte_t pn53x_preamble[3] = { 0x00, 0x00, 0xff };
@@ -521,6 +521,7 @@ read:
     return -1;
   }
   // The PN53x command is done and we successfully received the reply
+  pnd->iLastError = 0;
   return len;
 }