diff --git a/docs/Makefile b/docs/Makefile
index 67eadd57d..814aed7b5 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -19,7 +19,7 @@ ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) sou
 # the i18n builder cannot share the environment and doctrees with the others
 I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
 
-.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest coverage spelling gettext ipynb2rst
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest coverage spelling gettext
 
 help:
 	@echo "Please use \`make <target>' where <target> is one of"