diff --git a/pylot/core/io/data.py b/pylot/core/io/data.py
index a5449092..586736bd 100644
--- a/pylot/core/io/data.py
+++ b/pylot/core/io/data.py
@@ -190,20 +190,20 @@ class Data(object):
         elif fnext == '.obs':
             try:
                 self.get_evt_data().write(fnout + fnext, format=evtformat)
+                # write header afterwards
+                evtdata = self.get_evt_data()
+                evid = str(evtdata.resource_id).split('/')[1]
+                header = '# EQEVENT:  Label: EQ%s  Loc:  X 0.00  Y 0.00  Z 10.00  OT 0.00 \n' % evid
+                nllocfile = open(fnout + fnext)
+                l = nllocfile.readlines()
+                nllocfile.close()
+                l.insert(0, header)
+                nllocfile = open(fnout + fnext, 'w')
+                nllocfile.write("".join(l))
+                nllocfile.close()
             except KeyError as e:
                 raise KeyError('''{0} export format
                                   not implemented: {1}'''.format(evtformat, e))
-            # write header afterwards
-            evtdata = self.get_evt_data()
-            evid = str(evtdata.resource_id).split('/')[1]
-            header = '# EQEVENT:  Label: EQ%s  Loc:  X 0.00  Y 0.00  Z 10.00  OT 0.00 \n' % evid
-            nllocfile = open(fnout + fnext)
-            l = nllocfile.readlines()
-            nllocfile.close()
-            l.insert(0, header)
-            nllocfile = open(fnout + fnext, 'w')
-            nllocfile.write("".join(l))
-            nllocfile.close()
 
     def getComp(self):
         """