diff --git a/pyserialext/RS485Ext.py b/pyserialext/RS485Ext.py
index c20aed7..30cecba 100644
--- a/pyserialext/RS485Ext.py
+++ b/pyserialext/RS485Ext.py
@@ -7,13 +7,10 @@ class RS485Ext(serial.rs485.RS485):
     def __init__(self, *args, **kwargs):
         super(RS485Ext, self).__init__(*args, **kwargs)
         self.writec = ctypes.cdll.LoadLibrary('writec.so')
-        fd = self.fileno()
-        r = self.writec.set_rs485_mode(fd)
+        r = self.writec.init()
 
     def write(self, b):
         d = serial.serialutil.to_bytes(b)
-        l = len(d)
-        fd = self.fileno()
-        r = self.writec.writec(fd, d, l)
+        r = self.writec.writec(self.fileno(), d, len(d))
         return r
 
diff --git a/pyserialext/writec.c b/pyserialext/writec.c
index 768a0fa..76358ac 100644
--- a/pyserialext/writec.c
+++ b/pyserialext/writec.c
@@ -6,7 +6,7 @@
 
 const uint8_t DE_PIN = 0;
 
-int set_rs485_mode(int fd) {
+int init() {
   wiringPiSetup();
   pinMode(DE_PIN, OUTPUT);
   digitalWrite(DE_PIN, HIGH);