diff --git a/release/scripts/modules/rna_prop_ui.py b/release/scripts/modules/rna_prop_ui.py
index 8079c461e43..246fa4bdb7d 100644
--- a/release/scripts/modules/rna_prop_ui.py
+++ b/release/scripts/modules/rna_prop_ui.py
@@ -164,10 +164,6 @@ class WM_OT_properties_edit(bpy.types.Operator):
     max = rna_max
     description = StringProperty(name="Tip", default="")
 
-    # the class instance is not persistant, need to store in the class
-    # not ideal but changes as the op runs.
-    _last_prop = ['']
-
     def execute(self, context):
         path = self.properties.path
         value = self.properties.value
@@ -209,7 +205,7 @@ class WM_OT_properties_edit(bpy.types.Operator):
 
     def invoke(self, context, event):
 
-        self._last_prop[:] = [self.properties.property]
+        self._last_prop = [self.properties.property]
 
         item = eval("context.%s" % self.properties.path)
 
diff --git a/release/scripts/op/wm.py b/release/scripts/op/wm.py
index a6ecfe21375..c70e80cdfe8 100644
--- a/release/scripts/op/wm.py
+++ b/release/scripts/op/wm.py
@@ -308,14 +308,11 @@ class WM_OT_context_modal_mouse(bpy.types.Operator):
     invert = BoolProperty(default=False, description="Invert the mouse input")
     initial_x = IntProperty(options={'HIDDEN'})
 
-    _values = {}
-
     def _values_store(self, context):
         path_iter = self.properties.path_iter
         path_item = self.properties.path_item
 
-        self._values.clear()
-        values = self._values
+        self._values = values = {}
 
         for item in getattr(context, path_iter):
             try: