diff --git a/src/python_testing/TC_RVCCLEANM_1_2.py b/src/python_testing/TC_RVCCLEANM_1_2.py
index 9090a3948bfcc8..cbda91e1945f90 100644
--- a/src/python_testing/TC_RVCCLEANM_1_2.py
+++ b/src/python_testing/TC_RVCCLEANM_1_2.py
@@ -52,7 +52,8 @@ async def test_TC_RVCCLEANM_1_2(self):
 
             logging.info("SupportedModes: %s" % (supported_modes))
 
-            asserts.assert_greater_equal(len(supported_modes), 1, "SupportedModes must have at least one entry!")
+            asserts.assert_greater_equal(len(supported_modes), 2, "SupportedModes must have at least 2 entries!")
+            asserts.assert_less_equal(len(supported_modes), 255, "SupportedModes must have at most 255 entries!")
 
             modes = []
             for m in supported_modes:
diff --git a/src/python_testing/TC_RVCRUNM_1_2.py b/src/python_testing/TC_RVCRUNM_1_2.py
index 7029e70163217f..8ee3e93bb42cb9 100644
--- a/src/python_testing/TC_RVCRUNM_1_2.py
+++ b/src/python_testing/TC_RVCRUNM_1_2.py
@@ -52,7 +52,8 @@ async def test_TC_RVCRUNM_1_2(self):
 
             logging.info("SupportedModes: %s" % (supported_modes))
 
-            asserts.assert_greater_equal(len(supported_modes), 2, "SupportedModes must have at least two entries!")
+            asserts.assert_greater_equal(len(supported_modes), 2, "SupportedModes must have at least 2 entries!")
+            asserts.assert_less_equal(len(supported_modes), 255, "SupportedModes must have at most 255 entries!")
 
             modes = []
             for m in supported_modes: