diff --git a/gpl-lgpl.tex b/gpl-lgpl.tex
index 22c2981..2e3f81e 100644
--- a/gpl-lgpl.tex
+++ b/gpl-lgpl.tex
@@ -167,7 +167,7 @@ Many people refer to software that gives these freedoms as ``Open Source.''
 Besides having a different political focus than those who call it Free
 Software,\footnote{The political differences between the Free Software
   Movement and the Open Source Movement are documented on FSF's Web site at
-  {\tt http://www.fsf.org/licensing/essays/free-software-for-freedom.html}.}
+  \url{http://www.fsf.org/licensing/essays/free-software-for-freedom.html}.}
 Those who call the software ``Open Source'' are often focused on a side
 issue.  Specifically, user access to the source code of a program is a
 prerequisite to make use of the freedom to modify.  However, the important