diff --git a/trappy/systrace.py b/trappy/systrace.py
index 41d806fac2b3a0d9bdf497edc8fbdc7dbf6d600c..de58f413df5ac0ac452eb1a5f3b36f3ee0394774 100644
--- a/trappy/systrace.py
+++ b/trappy/systrace.py
@@ -21,7 +21,7 @@ from trappy.ftrace import GenericFTrace
 import re
 
 SYSTRACE_EVENT = re.compile(
-    r'^(?P<event>[A-Z])(\|(?P<pid>\d+)\|(?P<func>[^|]*)(\|(?P<data>.*))?)?')
+    r'^(?P<event>[A-Z])(\|(?P<pid>\d+))?(\|(?P<func>[^|]*)(\|(?P<data>.*))?)?')
 
 class drop_before_trace(object):
     """Object that, when called, returns True if the line is not part of