diff --git a/dpdata/plugins/amber.py b/dpdata/plugins/amber.py
index 81e279138..1568dd528 100644
--- a/dpdata/plugins/amber.py
+++ b/dpdata/plugins/amber.py
@@ -5,7 +5,7 @@
 
 @Format.register("amber/md")
 class AmberMDFormat(Format):
-    def from_system(self, file_name=None, parm7_file=None, nc_file=None, use_element_symbols=None):
+    def from_system(self, file_name=None, parm7_file=None, nc_file=None, use_element_symbols=None, **kwargs):
         # assume the prefix is the same if the spefic name is not given
         if parm7_file is None:
             parm7_file = file_name + ".parm7"