diff --git a/tools/maint/run_python.bat b/tools/maint/run_python.bat
index e9080623b77f0..9170dae6f949b 100644
--- a/tools/maint/run_python.bat
+++ b/tools/maint/run_python.bat
@@ -2,8 +2,8 @@
 ::
 :: Automatically generated by `create_entry_points.py`; DO NOT EDIT.
 ::
-:: To make modifications to this file, edit `tools\run_python.bat` and then run
-:: `tools\maint\create_entry_points.py`
+:: To make modifications to this file, edit `tools\maint\run_python.bat` and
+:: then run `tools\maint\create_entry_points.py`
 
 :: N.b. In Windows .bat scripts, the ':' character cannot appear inside any if () blocks,
 :: or there will be a parsing error.
@@ -70,17 +70,24 @@
   )
 )
 
+:: N.b. when passing the -E flag to Python (ignore PYTHON* environment
+:: variables (such as PYTHONPATH)), Python will revert to cp1252 encoding
+:: on Windows by default, if stdout/stderr is redirected.
+:: https://github.com/buildbot/buildbot/issues/9047
+:: To avoid this from causing issues, explicitly specify the -X utf8 encoding
+:: on tool invocations.
+
 :NORMAL_EXIT
-@"%_EM_PY%" -E "%MYDIR%%~n0.py" %*
+@"%_EM_PY%" -E -X utf8 "%MYDIR%%~n0.py" %*
 @exit %ERRORLEVEL%
 
 :MUTE_STDIN
-@"%_EM_PY%" -E "%MYDIR%%~n0.py" %* < NUL
+@"%_EM_PY%" -E -X utf8 "%MYDIR%%~n0.py" %* < NUL
 @exit /b %ERRORLEVEL%
 
 :MUTE_STDIN_EXIT
-@"%_EM_PY%" -E "%MYDIR%%~n0.py" %* < NUL
+@"%_EM_PY%" -E -X utf8 "%MYDIR%%~n0.py" %* < NUL
 @exit %ERRORLEVEL%
 
 :NORMAL
-@"%_EM_PY%" -E "%MYDIR%%~n0.py" %*
+@"%_EM_PY%" -E -X utf8 "%MYDIR%%~n0.py" %*
diff --git a/tools/maint/run_python_compiler.bat b/tools/maint/run_python_compiler.bat
index dd5aa6565a35b..0d4c95fb90860 100644
--- a/tools/maint/run_python_compiler.bat
+++ b/tools/maint/run_python_compiler.bat
@@ -39,10 +39,17 @@
 )
 :FOUND_MYDIR
 
+:: N.b. when passing the -E flag to Python (ignore PYTHON* environment
+:: variables (such as PYTHONPATH)), Python will revert to cp1252 encoding
+:: on Windows by default, if stdout/stderr is redirected.
+:: https://github.com/buildbot/buildbot/issues/9047
+:: To avoid this from causing issues, explicitly specify the -X utf8 encoding
+:: on tool invocations.
+
 :: If _EMCC_CCACHE is not set, do a regular invocation of the python compiler driver.
 :: Otherwise remove the ccache env. var, and then reinvoke this script with ccache enabled.
 @if "%_EMCC_CCACHE%"=="" (
-  set CMD="%_EM_PY%" -E "%MYDIR%%~n0.py"
+  set CMD="%_EM_PY%" -E -X utf8 "%MYDIR%%~n0.py"
 ) else (
   set _EMCC_CCACHE=
   set CMD=ccache "%MYDIR%%~n0.bat"