diff --git a/imblearn/utils/_param_validation.py b/imblearn/utils/_param_validation.py
index ae3855945..151aa4eed 100644
--- a/imblearn/utils/_param_validation.py
+++ b/imblearn/utils/_param_validation.py
@@ -917,7 +917,7 @@ def generate_valid_param(constraint):
         _CVObjects,
         _InstancesOf,
         _IterablesNotString,
-        _MissingValues,
+        # _MissingValues,
         _NoneConstraint,
         _PandasNAConstraint,
         _RandomStates,