diff --git a/testing/python3/DcgmGroup.py b/testing/python3/DcgmGroup.py
index 22788124..205371c0 100644
--- a/testing/python3/DcgmGroup.py
+++ b/testing/python3/DcgmGroup.py
@@ -510,7 +510,7 @@ def RunSpecificTest(self, testName):
         runDiagInfo = dcgm_structs.c_dcgmRunDiag_v10()
         runDiagInfo.version = dcgm_structs.dcgmRunDiag_version10
         for i in range(len(testName)):
-            runDiagInfo.testNames[0][i] = testName[i]
+            runDiagInfo.testNames[i] = testName[i]
         runDiagInfo.groupId = self._groupId
         runDiagInfo.validate = dcgm_structs.DCGM_POLICY_VALID_NONE
         response = dcgm_agent.dcgmActionValidate_v2(self._dcgmHandle.handle, runDiagInfo)