diff --git a/development_icon_get.py b/development_icon_get.py
index cbeeea9aa2983e548fe1d8d32b661a50cd0367e1..ea175539f6a21cc419afd89d7bfa82f5ccbfb26e 100644
--- a/development_icon_get.py
+++ b/development_icon_get.py
@@ -487,14 +487,14 @@ class IV_OT_icons_show(bpy.types.Operator):
             self, width=self.width)
 
 
-classes = [
+classes = (
     IV_PT_icons,
     IV_HT_icons,
     IV_OT_panel_menu_call,
     IV_OT_icon_select,
     IV_OT_icons_show,
     IV_Preferences,
-]
+)
 
 
 def register():
diff --git a/io_anim_bvh/__init__.py b/io_anim_bvh/__init__.py
index 01484af91ee91d4aebc26237dacbba3db9fbf1e2..68d08c1555ec508c61eab62bf1ea1ba0b2214167 100644
--- a/io_anim_bvh/__init__.py
+++ b/io_anim_bvh/__init__.py
@@ -217,10 +217,10 @@ def menu_func_export(self, context):
     self.layout.operator(ExportBVH.bl_idname, text="Motion Capture (.bvh)")
 
 
-classes = [
+classes = (
     ImportBVH,
     ExportBVH
-]
+)
 
 def register():
     for cls in classes:
diff --git a/io_mesh_stl/__init__.py b/io_mesh_stl/__init__.py
index 934cdbb4c0b3ff034bfcf7c5a7c29ce3cbff5834..6859627c6a27e007efee47593e6ed955d51f460c 100644
--- a/io_mesh_stl/__init__.py
+++ b/io_mesh_stl/__init__.py
@@ -254,10 +254,10 @@ def menu_export(self, context):
     self.layout.operator(ExportSTL.bl_idname, text="Stl (.stl)")
 
 
-classes = [
+classes = (
     ImportSTL,
     ExportSTL
-]
+)
 
 def register():
     for cls in classes:
diff --git a/io_shape_mdd/__init__.py b/io_shape_mdd/__init__.py
index 169e0c17bbab773b4225f83f4920613a9def146d..b6f0e734f045a586a6ffdaaee20f4cedd32acb2c 100644
--- a/io_shape_mdd/__init__.py
+++ b/io_shape_mdd/__init__.py
@@ -164,10 +164,10 @@ def menu_func_export(self, context):
                          )
 
 
-classes = [
+classes = (
     ImportMDD,
     ExportMDD
-]
+)
 
 def register():
     for cls in classes: