diff --git a/src/python/_rpitxmodule.c b/src/python/_rpitxmodule.c
index b1e9fd8..81f4779 100644
--- a/src/python/_rpitxmodule.c
+++ b/src/python/_rpitxmodule.c
@@ -103,16 +103,14 @@ static void reset(void) {
 
 static PyObject*
 _rpitx_broadcast_fm(PyObject* self, PyObject* args) {
-	long int address;
 	float frequency;
 
-	assert(sizeof(address) == sizeof(sampleBase));
-	if (!PyArg_ParseTuple(args, "lif", &address, &sampleLength, &frequency)) {
+    assert(sizeof(sampleBase) == sizeof(unsigned long));
+	if (!PyArg_ParseTuple(args, "Lif", &sampleBase, &sampleLength, &frequency)) {
 		PyErr_SetString(rpitxError, "Invalid arguments");
 		return NULL;
 	}
 
-	sampleBase = ((void*)address);
 	sampleOffset = 0;
 
 	SF_VIRTUAL_IO virtualIo = {
diff --git a/src/python/rpitx/_hidden.py b/src/python/rpitx/_hidden.py
index d2b81bb..2c0e4dd 100644
--- a/src/python/rpitx/_hidden.py
+++ b/src/python/rpitx/_hidden.py
@@ -5,6 +5,7 @@ import StringIO
 import _rpitx
 import array
 import logging
+import sys
 import wave
 
 
@@ -37,7 +38,6 @@ def broadcast_fm(file_, frequency):
     wav_writer.writeframes(raw_audio_data.raw_data)
     wav_writer.close()
 
-    raw_array = array.array('c')
-    raw_array.fromstring(wav_data.getvalue())
+    raw_array = array.array('c', wav_data.getvalue())
     array_address, length = raw_array.buffer_info()
-    _rpitx.broadcast_fm(long(array_address), length, frequency)
+    _rpitx.broadcast_fm(array_address, length, frequency)