diff --git a/simso/configuration/Configuration.py b/simso/configuration/Configuration.py
index e81a812..4c0f2d7 100644
--- a/simso/configuration/Configuration.py
+++ b/simso/configuration/Configuration.py
@@ -278,7 +278,7 @@ class Configuration(object):
         return self._scheduler_info
 
     def add_task(self, name, identifier, task_type="Periodic",
-                 abort_on_miss=False, period=10, activation_date=0,
+                 abort_on_miss=True, period=10, activation_date=0,
                  n_instr=0, mix=0.5, stack_file="", wcet=0, acet=0,
                  et_stddev=0, deadline=10, base_cpi=1.0, followed_by=None,
                  list_activation_dates=[], preemption_cost=0, data=None):
diff --git a/simso/configuration/parser.py b/simso/configuration/parser.py
index 51d5f5b..d64e0b3 100644
--- a/simso/configuration/parser.py
+++ b/simso/configuration/parser.py
@@ -93,8 +93,8 @@ class Parser(object):
                 attr['name'].value,
                 int(attr['id'].value),
                 task_type,
-                'abort_on_miss' in attr
-                and attr['abort_on_miss'].value == 'yes',
+                'abort_on_miss' not in attr
+                or attr['abort_on_miss'].value == 'yes',
                 float(attr['period'].value),
                 float(attr['activationDate'].value)
                 if 'activationDate' in attr else 0,