diff --git a/ppdet/utils/cli.py b/ppdet/utils/cli.py
index a903c20a2a131e29a686c50ba0fd8e59f82f2c2d..7b7a89060a7de3fff7168d9773b5aae056fad011 100644
--- a/ppdet/utils/cli.py
+++ b/ppdet/utils/cli.py
@@ -63,7 +63,7 @@ class ArgsParser(ArgumentParser):
             return config
         for s in opts:
             s = s.strip()
-            k, v = s.split('=', maxsplit=1)
+            k, v = s.split('=', 1)
             if '.' not in k:
                 config[k] = yaml.load(v, Loader=yaml.Loader)
             else: