diff --git a/opennsa/backends/oess.py b/opennsa/backends/oess.py
index bb6e0a53e8a274893cd9a1f95b26f2edaf933e36..46523ebc388cdc6867c65ebcb98a2e891af727d7 100644
--- a/opennsa/backends/oess.py
+++ b/opennsa/backends/oess.py
@@ -399,7 +399,7 @@ class OESSConnectionManager:
 
         return d
 
-  def teardownLink(self, connection_id, source_target, dest_target, bandwidth):
+    def teardownLink(self, connection_id, source_target, dest_target, bandwidth):
         def logTearDownLink(pt, source_target, dest_target):
             log.msg('Link %s -> %s down' % (source_target, dest_target),
                     system=self.log_system)