diff --git a/unit-tests/run-unit-tests.py b/unit-tests/run-unit-tests.py
index 1cda72b9f1..0b52053050 100644
--- a/unit-tests/run-unit-tests.py
+++ b/unit-tests/run-unit-tests.py
@@ -450,7 +450,7 @@ def test_wrapper_( test, configuration=None, repetition=1, retry=0, sns=None ):
     return False
 
 
-def test_wrapper( test, configuration=None, repetition=1, sns=None ):
+def test_wrapper( test, configuration=None, repetition=1, serial_numbers=None ):
     global n_tests
     n_tests += 1
     for retry in range( test.config.retries + 1 ):
@@ -459,11 +459,11 @@ def test_wrapper( test, configuration=None, repetition=1, sns=None ):
                 log.debug_unindent()  # just to make it stand out a little more
                 log.d( f'  Failed; retry #{retry}' )
                 log.debug_indent()
-            if no_reset:
+            if no_reset or not serial_numbers:
                 time.sleep(1)  # small pause between tries
             else:
                 devices.enable_only( serial_numbers, recycle=True )
-        if test_wrapper_( test, configuration, repetition, retry, sns ):
+        if test_wrapper_( test, configuration, repetition, retry, serial_numbers ):
             return True
         log._n_errors -= 1
 
@@ -599,7 +599,7 @@ def test_wrapper( test, configuration=None, repetition=1, sns=None ):
                     except RuntimeError as e:
                         log.w( log.red + test.name + log.reset + ': ' + str( e ) )
                     else:
-                        test_ok = test_wrapper( test, configuration, repetition, sns=serial_numbers ) and test_ok
+                        test_ok = test_wrapper( test, configuration, repetition, serial_numbers ) and test_ok
                     finally:
                         log.debug_unindent()
             if not test_ok: