diff --git a/jansson.spec b/jansson.spec
index 7d3c7d9..b33707d 100644
--- a/jansson.spec
+++ b/jansson.spec
@@ -31,6 +31,10 @@ Development documentation for jansson.
 %prep
 %setup -q
 
+%if 0%{?rhel} == 6
+%{__sed} -i 's/code-block:: shell/code-block:: none/g' doc/*.rst
+%endif
+
 %build
 %configure --disable-static
 make %{?_smp_mflags}