diff --git a/OpenColorIO.spec b/OpenColorIO.spec
index 602ab3a..64c64b7 100644
--- a/OpenColorIO.spec
+++ b/OpenColorIO.spec
@@ -88,7 +88,8 @@ rm -f ext/yaml*
 
 # Try building for EPEL w/ cmake 2.6.
 %if 0%{?el6}
-sed -i 's|cmake_minimum_required(VERSION 2.8)|cmake_minimum_required(VERSION 2.6)|' CMakeLists.txt
+sed -i -e 's|cmake_minimum_required(VERSION 2.8)|cmake_minimum_required(VERSION 2.6)|' \
+    -e '|include(ExternalProject)|d' CMakeLists.txt
 %endif