diff --git a/doc/gcd/math-gcd.qbk b/doc/gcd/math-gcd.qbk
index 4e45bfa..2e3673a 100644
--- a/doc/gcd/math-gcd.qbk
+++ b/doc/gcd/math-gcd.qbk
@@ -12,7 +12,7 @@
 ]
 
 This manual is also available in 
-[@http:svn.boost.org/svn/boost/sandbox/pdf/math/release/math-gcd.pdf 
+[@http://svn.boost.org/svn/boost/sandbox/pdf/math/release/math-gcd.pdf 
 printer friendly PDF format].