diff --git a/trans/models.py b/trans/models.py
index d9c9b6dc7..83061e6d2 100644
--- a/trans/models.py
+++ b/trans/models.py
@@ -189,6 +189,8 @@ class Translation(models.Model):
         # Load po file
         store = factory.getobject(os.path.join(self.subproject.get_path(), self.filename))
         for unit in store.units:
+            if unit.isheader():
+                continue
             newunit = Unit.objects.update_from_unit(self, unit)
             try:
                 oldunits.remove(newunit.id)