diff --git a/rigify/utils/bones.py b/rigify/utils/bones.py
index 8c00d4a733b13f2fb2786cc738d6ba497d249fa9..4416a1d6c9443d0c83499b42a8f6db5fb2c35a63 100644
--- a/rigify/utils/bones.py
+++ b/rigify/utils/bones.py
@@ -21,7 +21,6 @@
 import bpy
 import math
 from mathutils import Vector, Matrix, Color
-from rna_prop_ui import rna_idprop_ui_prop_get
 
 from .errors import MetarigError
 from .naming import get_name, make_derived_name, is_control_bone
diff --git a/rigify/utils/mechanism.py b/rigify/utils/mechanism.py
index bc4e06eaecdbb542829d8488cfe608d17480ec5c..b4b2d389f00df13b7a3dcf33ff47bc4f519749bf 100644
--- a/rigify/utils/mechanism.py
+++ b/rigify/utils/mechanism.py
@@ -429,7 +429,7 @@ def copy_custom_properties(src, dest, *, prefix='', dest_prefix='', link_driver=
         if key.startswith(prefix) and key not in exclude:
             new_key = dest_prefix + key[len(prefix):]
 
-            info = rna_idprop_ui_prop_get(src, key, False)
+            info = rna_idprop_ui_prop_get(src, key, create=False)
 
             if src != dest or new_key != key:
                 dest[new_key] = value