diff --git a/pysimavr/sim.py b/pysimavr/sim.py
index c2bf4f8..e44123e 100644
--- a/pysimavr/sim.py
+++ b/pysimavr/sim.py
@@ -29,7 +29,7 @@ class ArduinoSim(object):
     '''arduino code builder and simulator for serial testing'''
     def __init__(self,
                  snippet=None,
-                 mcu='atmega328',
+                 mcu='atmega328p',
                  f_cpu=16000000,
                  extra_lib=None,
                  timespan=0.01,
diff --git a/pysimavr/swig/parts/ac_input.c b/pysimavr/swig/parts/ac_input.c
index d50c6bc..18b1aa2 100644
--- a/pysimavr/swig/parts/ac_input.c
+++ b/pysimavr/swig/parts/ac_input.c
@@ -23,6 +23,7 @@
 #include "sim_avr.h"
 #include "ac_input.h"
 #include "stdio.h"
+#include "sim_time.h"
 
 static avr_cycle_count_t
 switch_auto(struct avr_t * avr,
diff --git a/tests/test_udp.py b/tests/test_udp.py
index 50b825a..ca7d12e 100644
--- a/tests/test_udp.py
+++ b/tests/test_udp.py
@@ -12,7 +12,7 @@ def test_udp():
         //delay(100);
     }
     '''
-    x = ArduinoSim(snippet=snippet, timespan=2.5).get_serial()
+    x = ArduinoSim(snippet=snippet, timespan=10).get_serial()
     print x
     lines = x.splitlines()
     eq_(len(lines), 100)