diff --git a/IPython/nbconvert/exporters/reveal.py b/IPython/nbconvert/exporters/reveal.py
index c22f56a..0d63eb1 100644
--- a/IPython/nbconvert/exporters/reveal.py
+++ b/IPython/nbconvert/exporters/reveal.py
@@ -45,7 +45,7 @@ class RevealExporter(BasicHTMLExporter):
         super(RevealExporter, self)._register_transformers()
         
         #Register reveal help transformer
-        self.register_transformer(transformers.RevealHelpTransformer, True)
+        self.register_transformer(transformers.RevealHelpTransformer, enabled=True)
 
     @property
     def default_config(self):
diff --git a/IPython/nbconvert/exporters/sphinx_howto.py b/IPython/nbconvert/exporters/sphinx_howto.py
index 29a1999..1056850 100644
--- a/IPython/nbconvert/exporters/sphinx_howto.py
+++ b/IPython/nbconvert/exporters/sphinx_howto.py
@@ -42,4 +42,4 @@ class SphinxHowtoExporter(LatexExporter):
         super(SphinxHowtoExporter, self)._register_transformers()
         
         #Register sphinx latex transformer
-        self.register_transformer(transformers.SphinxTransformer, True) 
+        self.register_transformer(transformers.SphinxTransformer, enabled=True)