diff --git a/src/sas/qtgui/Calculators/SAXSPluginModelGenerator.py b/src/sas/qtgui/Calculators/SAXSPluginModelGenerator.py
index 6ac5774044..59aa812953 100644
--- a/src/sas/qtgui/Calculators/SAXSPluginModelGenerator.py
+++ b/src/sas/qtgui/Calculators/SAXSPluginModelGenerator.py
@@ -22,7 +22,7 @@ def write_plugin_model(structure_path: str):
 
     path = Path(find_plugins_dir()) / "ausaxs_saxs_plugin.py"
     text = get_model_text(structure_path)
-    with open(path, 'w') as f:
+    with open(path, 'w', encoding="utf-8") as f:
         f.write(text)
 
 def get_model_text(structure_path: str) -> str:
diff --git a/src/sas/qtgui/Utilities/ModelEditors/AddMultEditor/AddMultEditor.py b/src/sas/qtgui/Utilities/ModelEditors/AddMultEditor/AddMultEditor.py
index b573ba10a5..b2eed79f76 100644
--- a/src/sas/qtgui/Utilities/ModelEditors/AddMultEditor/AddMultEditor.py
+++ b/src/sas/qtgui/Utilities/ModelEditors/AddMultEditor/AddMultEditor.py
@@ -253,7 +253,7 @@ def write_new_model_to_file(self, fname, model1_name, model2_name, operator):
                                      operator=operator,
                                      desc_line=desc_line)
 
-        with open(fname, 'w') as out_f:
+        with open(fname, 'w', encoding="utf-8") as out_f:
             out_f.write(output)
 
     def updateModels(self):
diff --git a/src/sas/qtgui/Utilities/ModelEditors/ReparamEditor/ReparameterizationEditor.py b/src/sas/qtgui/Utilities/ModelEditors/ReparamEditor/ReparameterizationEditor.py
index 269fabc77d..ffdf0a0cf0 100644
--- a/src/sas/qtgui/Utilities/ModelEditors/ReparamEditor/ReparameterizationEditor.py
+++ b/src/sas/qtgui/Utilities/ModelEditors/ReparamEditor/ReparameterizationEditor.py
@@ -628,7 +628,7 @@ def writeModel(output_file_path: str | pathlib.Path, model_text: str):
         :param model_text: str of the model text to write
         """
         try:
-            with open(output_file_path, 'w') as f:
+            with open(output_file_path, 'w', encoding="utf-8") as f:
                 f.write(model_text)
         except Exception as ex:
             logger.error("Error writing model to file: %s" % ex)