diff --git a/TEST_APPS/testcases/nanostack_mac_tester/ED_scan.py b/TEST_APPS/testcases/nanostack_mac_tester/ED_scan.py
index 3bac432fbfc..7ef6e435e18 100644
--- a/TEST_APPS/testcases/nanostack_mac_tester/ED_scan.py
+++ b/TEST_APPS/testcases/nanostack_mac_tester/ED_scan.py
@@ -121,7 +121,11 @@ def case(self):
             except TestStepFail:
                 self.logger.info("Warning, iteration failed #"  + str(loop+1))
                 loop = loop + 1
-                self.delay(5)
+                if (loop < 5):
+                    self.stop_event.set()
+                    self.th.join()
+                    self.delay(5)
+
         else:
              raise TestStepFail("Too many failed iterations!")