diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 573ca0f015..0a6500d98e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -17,6 +17,7 @@ Redis       8.6
 Fixed
 ~~~~~
 * Fix ``TypeError`` when displaying help for actions whose parameters have no ``description`` key. #6375
+* Fix utf-8 encode before checking paramter max size #6352
 
 Changed
 ~~~~~~~
diff --git a/contrib/runners/python_runner/python_runner/python_runner.py b/contrib/runners/python_runner/python_runner/python_runner.py
index a8200e0bb3..9bba07985f 100644
--- a/contrib/runners/python_runner/python_runner/python_runner.py
+++ b/contrib/runners/python_runner/python_runner/python_runner.py
@@ -188,7 +188,10 @@ def run(self, action_parameters):
         # failure to fork the wrapper process when using large parameters.
         stdin = None
         stdin_params = None
-        if len(serialized_parameters) >= MAX_PARAM_LENGTH:
+        if (
+            len(serialized_parameters.encode(sys.getdefaultencoding(), errors="ignore"))
+            >= MAX_PARAM_LENGTH
+        ):
             stdin = subprocess.PIPE
             LOG.debug("Parameters are too big...changing to stdin")
             stdin_params = '{"parameters": %s}\n' % (serialized_parameters)
diff --git a/contrib/runners/python_runner/tests/unit/test_output_schema.py b/contrib/runners/python_runner/tests/unit/test_output_schema.py
index c5fd0d00e2..fe09df162d 100644
--- a/contrib/runners/python_runner/tests/unit/test_output_schema.py
+++ b/contrib/runners/python_runner/tests/unit/test_output_schema.py
@@ -40,6 +40,7 @@
 MOCK_SYS = mock.Mock()
 MOCK_SYS.argv = []
 MOCK_SYS.executable = sys.executable
+MOCK_SYS.getdefaultencoding.return_value = sys.getdefaultencoding()
 
 MOCK_EXECUTION = mock.Mock()
 MOCK_EXECUTION.id = "598dbf0c0640fd54bffc688b"
diff --git a/contrib/runners/python_runner/tests/unit/test_pythonrunner.py b/contrib/runners/python_runner/tests/unit/test_pythonrunner.py
index 22d9e14b36..f66d6f8f50 100644
--- a/contrib/runners/python_runner/tests/unit/test_pythonrunner.py
+++ b/contrib/runners/python_runner/tests/unit/test_pythonrunner.py
@@ -97,6 +97,7 @@
 mock_sys = mock.Mock()
 mock_sys.argv = []
 mock_sys.executable = sys.executable
+mock_sys.getdefaultencoding.return_value = sys.getdefaultencoding()
 
 MOCK_EXECUTION = mock.Mock()
 MOCK_EXECUTION.id = "598dbf0c0640fd54bffc688b"