diff --git a/mace/python/tools/converter_tool/onnx_converter.py b/mace/python/tools/converter_tool/onnx_converter.py
index fff5241c9c1372e5e716ae04b3eb494ce7bb95a9..d2baae2abb4f2bd73715fb96fa7d30ab6a8581f9 100644
--- a/mace/python/tools/converter_tool/onnx_converter.py
+++ b/mace/python/tools/converter_tool/onnx_converter.py
@@ -230,7 +230,7 @@ def onnx_dtype(dtype):
 class OnnxNode(object):
     def __init__(self, node):
         self.name = str(node.name)
-        if self.name=='':
+        if self.name == '':
             self.name = str(node.output)
         self.op_type = str(node.op_type)
         self.domain = str(node.domain)