diff --git a/scripts/tests/run_java_test.py b/scripts/tests/run_java_test.py
index bb0021526f2276..8f30de2a1c643b 100755
--- a/scripts/tests/run_java_test.py
+++ b/scripts/tests/run_java_test.py
@@ -55,7 +55,7 @@ def main(app: str, app_args: str, tool_path: str, tool_cluster: str, tool_args:
             raise Exception("Failed to remove /tmp/chip* for factory reset.")
 
         print("Contents of test directory: %s" % os.getcwd())
-        print(subprocess.check_output(["ls -l"], shell=True).decode('us-ascii'))
+        print(subprocess.check_output(["ls -l"], shell=True).decode('utf-8'))
 
         # Remove native app KVS if that was used
         kvs_match = re.search(r"--KVS (?P<kvs_path>[^ ]+)", app_args)
diff --git a/scripts/tests/run_python_test.py b/scripts/tests/run_python_test.py
index 87f6044c2a35f0..c607a5d07cf40f 100755
--- a/scripts/tests/run_python_test.py
+++ b/scripts/tests/run_python_test.py
@@ -92,7 +92,7 @@ def main(app: str, factoryreset: bool, app_args: str, script: str, script_args:
             raise Exception("Failed to remove /tmp/chip* for factory reset.")
 
         print("Contents of test directory: %s" % os.getcwd())
-        print(subprocess.check_output(["ls -l"], shell=True).decode('us-ascii'))
+        print(subprocess.check_output(["ls -l"], shell=True).decode('utf-8'))
 
         # Remove native app KVS if that was used
         kvs_match = re.search(r"--KVS (?P<kvs_path>[^ ]+)", app_args)