diff --git a/libnfc/buses/uart_posix.c b/libnfc/buses/uart_posix.c
index d6dd3a1..fc32c12 100644
--- a/libnfc/buses/uart_posix.c
+++ b/libnfc/buses/uart_posix.c
@@ -127,7 +127,8 @@ uart_flush_input(serial_port sp)
   }
   char *rx = malloc(available_bytes_count);
   // There is something available, read the data
-  read(UART_DATA(sp)->fd, rx, available_bytes_count);
+  res = read(UART_DATA(sp)->fd, rx, available_bytes_count);
+  (void) res;
   log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%d bytes have eatten.", available_bytes_count);
   free(rx);
 }