diff --git a/Doc/ref/ref.tex b/Doc/ref/ref.tex
index cf7d30a..7f679d6 100644
--- a/Doc/ref/ref.tex
+++ b/Doc/ref/ref.tex
@@ -4,8 +4,8 @@
 
 \author{
 	Guido van Rossum \\
-	Dept. CST, CWI, Kruislaan 413 \\
-	1098 SJ Amsterdam, The Netherlands \\
+	Dept. CST, CWI, P.O. Box 94079 \\
+	1090 GB Amsterdam, The Netherlands \\
 	E-mail: {\tt guido@cwi.nl}
 }