diff --git a/src/qonnx/transformation/extract_conv_bias.py b/src/qonnx/transformation/extract_conv_bias.py
index 14973d9d..a357d34d 100644
--- a/src/qonnx/transformation/extract_conv_bias.py
+++ b/src/qonnx/transformation/extract_conv_bias.py
@@ -78,7 +78,7 @@ def apply(self, model):
                         if quant_scale.shape != (1,):
                             model.set_initializer(producer.input[1], quant_scale.reshape(add_shape))
                         quant_zpt = model.get_initializer(producer.input[2])
-                        if quant_zpt.shape != (1,):
+                        if quant_zpt.size != 1:
                             model.set_initializer(producer.input[2], quant_zpt.reshape(add_shape))
                         model.set_tensor_shape(producer.output[0], add_shape)