diff --git a/Doc/lib/librandom.tex b/Doc/lib/librandom.tex
index 7a1b982bd67..6c2f7101257 100644
--- a/Doc/lib/librandom.tex
+++ b/Doc/lib/librandom.tex
@@ -278,7 +278,7 @@ called.
            An efficient and portable pseudo-random number generator'',
            \citetitle{Applied Statistics} 31 (1982) 188-190.}
 
-  \seeurl{http://www.npl.co.uk/ssfm/download/abstracts.html#196}{A modern
+  \seeurl{http://www.npl.co.uk/ssfm/download/abstracts.html\#196}{A modern
           variation of the Wichmann-Hill generator that greatly increases
           the period, and passes now-standard statistical tests that the
           original generator failed.}