diff --git a/rdflib/plugins/serializers/nquads.py b/rdflib/plugins/serializers/nquads.py
index f2ed78600..3785452bc 100644
--- a/rdflib/plugins/serializers/nquads.py
+++ b/rdflib/plugins/serializers/nquads.py
@@ -22,7 +22,7 @@ def __init__(self, store):
     def serialize(self, stream, base=None, encoding=None, **args):
         if base is not None:
             warnings.warn("NQuadsSerializer does not support base.")
-        if encoding is not None:
+        if encoding is not None and encoding.lower() != self.encoding.lower():
             warnings.warn("NQuadsSerializer does not use custom encoding.")
         encoding = self.encoding
         for context in self.store.contexts():
diff --git a/rdflib/plugins/serializers/nt.py b/rdflib/plugins/serializers/nt.py
index a85545f3b..77ea5e8c8 100644
--- a/rdflib/plugins/serializers/nt.py
+++ b/rdflib/plugins/serializers/nt.py
@@ -25,7 +25,7 @@ def __init__(self, store):
     def serialize(self, stream, base=None, encoding=None, **args):
         if base is not None:
             warnings.warn("NTSerializer does not support base.")
-        if encoding is not None:
+        if encoding is not None and encoding.lower() != self.encoding.lower():
             warnings.warn("NTSerializer does not use custom encoding.")
         encoding = self.encoding
         for triple in self.store: