diff --git a/gnuradio.spec b/gnuradio.spec
index e9daad8..0353a7b 100644
--- a/gnuradio.spec
+++ b/gnuradio.spec
@@ -51,7 +51,7 @@ BuildRequires:	gsl-devel, tex(latex), numpy, PyQt4-devel, python2-cheetah
 BuildRequires:	xdg-utils, python2-lxml, pygtk2-devel
 BuildRequires:	desktop-file-utils, python2-mako, python2-six
 BuildRequires:	uhd-devel, python2, cppzmq-devel, zeromq-devel, thrift
-BuildRequires:	python2-sphinx
+BuildRequires:	python2-sphinx, codec2-devel
 #BuildRequires:	python3-thrift
 %if ! 0%{?rhel:1}
 BuildRequires:	PyQwt-devel, qwt-devel, qwtplot3d-qt4-devel