diff --git a/imperative/python/megengine/functional/__init__.py b/imperative/python/megengine/functional/__init__.py
index 4dc2675aaf3c2130c2c5b4e27434ed99cd9884e2..37455891a26dd00cb60e6ec3a4482034fe0bbb95 100644
--- a/imperative/python/megengine/functional/__init__.py
+++ b/imperative/python/megengine/functional/__init__.py
@@ -10,7 +10,6 @@
 from .elemwise import *
 from .math import *
 from .nn import *
-from .quantized import conv_bias_activation
 from .tensor import *
 from .utils import *
 
diff --git a/imperative/python/megengine/functional/nn.py b/imperative/python/megengine/functional/nn.py
index 55037d8dbce4f4f86f3aaa2b192227ae7066e40d..3da95a79cb3ae542264f13f7e3e699b26edf5400 100644
--- a/imperative/python/megengine/functional/nn.py
+++ b/imperative/python/megengine/functional/nn.py
@@ -1526,4 +1526,5 @@ def nms(boxes: Tensor, scores: Tensor, iou_thresh: float) -> Tensor:
 
 
 
-from .loss import *
+from .loss import *  # isort:skip
+from .quantized import conv_bias_activation  # isort:skip
diff --git a/imperative/python/megengine/module/quantized/conv.py b/imperative/python/megengine/module/quantized/conv.py
index d5b756401bf1f7a2abc0e7eb13b9c20bfde4d8af..d8935cd790917c20d4dd53ebed0ee3206c4310f8 100644
--- a/imperative/python/megengine/module/quantized/conv.py
+++ b/imperative/python/megengine/module/quantized/conv.py
@@ -11,7 +11,7 @@ import numpy as np
 
 from ... import module as Float
 from ...core.tensor import dtype
-from ...functional import conv_bias_activation
+from ...functional.nn import conv_bias_activation
 from ...tensor import Parameter
 from ..qat import conv as QAT
 from .module import QuantizedModule
diff --git a/imperative/python/test/unit/functional/test_functional.py b/imperative/python/test/unit/functional/test_functional.py
index 25f96a2628daa85973892c38638dfb7497ac05b2..ec99c5ca7a09388121f7beb40dbffd68c2aff53b 100644
--- a/imperative/python/test/unit/functional/test_functional.py
+++ b/imperative/python/test/unit/functional/test_functional.py
@@ -438,7 +438,7 @@ def test_conv_bias():
                 inp = convert_to_nchw4(inp)
                 w = convert_to_nchw4(w)
                 b = convert_to_nchw4(b)
-            return F.conv_bias_activation(
+            return F.nn.conv_bias_activation(
                 inp,
                 w,
                 b,