diff --git a/parts.rst b/parts.rst
index b8d1d38..8e17358 100644
--- a/parts.rst
+++ b/parts.rst
@@ -354,7 +354,7 @@ perl 5.6.2
 Even more perl. 5.6.2 is the last version buildable with 5.004.
 
 autoconf 2.52
-==============
+=============
 
 GNU Autoconf is a tool for producing ``configure`` scripts for building, installing and
 packaging software on computer systems where a Bourne shell is available.