diff --git a/codegen/GenerateCode.py b/codegen/GenerateCode.py
index d4cb122d..121f123b 100644
--- a/codegen/GenerateCode.py
+++ b/codegen/GenerateCode.py
@@ -27,7 +27,7 @@ for class_ in description[ "classes" ]:
 
 githubObjectTemplate = django.template.loader.get_template( "GithubObject.py" )
 for class_ in description[ "classes" ]:
-    with open( os.path.join( os.path.dirname( __file__ ), "..", "src", "github", class_[ "name" ] + ".py" ), "w" ) as f:
+    with open( os.path.join( os.path.dirname( __file__ ), "..", "src", "github", class_[ "name" ] + ".py" ), "wb" ) as f:
         f.write( "# WARNING: this file is generated automaticaly.\n" )
         f.write( "# Do not modify it manually, your work would be lost.\n" )
         f.write( "\n" )
@@ -45,7 +45,7 @@ for class_ in description[ "classes" ]:
         f.write( "\n".join( code ) + "\n" )
 
 referenceOfClassesTemplate = django.template.loader.get_template( "ReferenceOfClasses.md" )
-with open( os.path.join( os.path.dirname( __file__ ), "..", "doc", "ReferenceOfClasses.md" ), "w" ) as f:
+with open( os.path.join( os.path.dirname( __file__ ), "..", "doc", "ReferenceOfClasses.md" ), "wb" ) as f:
     rawCode = referenceOfClassesTemplate.render( django.template.Context( description ) ).split( "\n" )
     code = list()
     for line in rawCode:
diff --git a/codegen/JsonDescriptionOfGithubApiV3/normalize.py b/codegen/JsonDescriptionOfGithubApiV3/normalize.py
index 782f5119..8b1ef6d1 100644
--- a/codegen/JsonDescriptionOfGithubApiV3/normalize.py
+++ b/codegen/JsonDescriptionOfGithubApiV3/normalize.py
@@ -367,7 +367,7 @@ class Description:
                     return obj.ToJson()
                 return json.JSONEncoder.default( self, obj )
 
-        with open( os.path.join( os.path.dirname( __file__ ), fileName ), "w" ) as f:
+        with open( os.path.join( os.path.dirname( __file__ ), fileName ), "wb" ) as f:
             json.dump( self, f, indent = 4, cls = Encoder )
 
 with open( os.path.join( os.path.dirname( __file__ ), "description.000.human_readable.json" ) ) as f: