diff --git a/pyphot/astropy/sandbox.py b/pyphot/astropy/sandbox.py
index 10fca47..4b44ec9 100644
--- a/pyphot/astropy/sandbox.py
+++ b/pyphot/astropy/sandbox.py
@@ -1534,9 +1534,11 @@ def add_filter(self, f, **kwargs):
             msg = "Filter wavelength must have units for storage."
             raise AttributeError(msg)
 
+        append = kwargs.pop('append', True)
+
         f.write_to("{0:s}".format(self.source),
                    tablename='/filters/{0}'.format(f.name),
-                   createparents=True,
+                   createparents=True, append=append,
                    **kwargs)
 
 
diff --git a/pyphot/sandbox.py b/pyphot/sandbox.py
index 4bdc951..af4a3a4 100644
--- a/pyphot/sandbox.py
+++ b/pyphot/sandbox.py
@@ -1527,9 +1527,11 @@ def add_filter(self, f, **kwargs):
             msg = "Filter wavelength must have units for storage."
             raise AttributeError(msg)
 
+        append = kwargs.pop('append', True)
+
         f.write_to("{0:s}".format(self.source),
                    tablename='/filters/{0}'.format(f.name),
-                   createparents=True,
+                   createparents=True, append=append,
                    **kwargs)