diff --git a/test/iscsi_tgt/calsoft/calsoft.py b/test/iscsi_tgt/calsoft/calsoft.py
index 2970328e6..d50d4c1b5 100755
--- a/test/iscsi_tgt/calsoft/calsoft.py
+++ b/test/iscsi_tgt/calsoft/calsoft.py
@@ -37,7 +37,7 @@ known_failed_cases = ['tc_ffp_15_2', 'tc_ffp_29_2', 'tc_ffp_29_3', 'tc_ffp_29_4'
 
 def run_case(case, result_list, log_dir_path):
     try:
-        case_log = subprocess.check_output("{}/{}".format(CALSOFT_BIN_PATH, case), stderr=subprocess.STDOUT, shell=True)
+        case_log = subprocess.check_output("{}/{}".format(CALSOFT_BIN_PATH, case), stderr=subprocess.STDOUT, shell=True).decode('utf-8')
     except subprocess.CalledProcessError as e:
         result_list.append({"Name": case, "Result": "FAIL"})
         case_log = e.output
diff --git a/test/iscsi_tgt/rpc_config/rpc_config.py b/test/iscsi_tgt/rpc_config/rpc_config.py
index 62c7bfb7a..bc7f7365e 100755
--- a/test/iscsi_tgt/rpc_config/rpc_config.py
+++ b/test/iscsi_tgt/rpc_config/rpc_config.py
@@ -65,7 +65,7 @@ class spdk_rpc(object):
             cmd = "{} {}".format(self.rpc_py, name)
             for arg in args:
                 cmd += " {}".format(arg)
-            return check_output(cmd, shell=True)
+            return check_output(cmd, shell=True).decode("utf-8")
         return call