diff --git a/latex/binarytrees.tex b/latex/binarytrees.tex
index 5f4b0c37..9b992724 100644
--- a/latex/binarytrees.tex
+++ b/latex/binarytrees.tex
@@ -8,7 +8,7 @@ \chapter{Binary Trees}
 \index{binary tree}%
 here comes from
 the fact that, when we draw them, the resultant drawing often resembles
-the trees found in a forest.  There are many ways of ways of defining
+the trees found in a forest.  There are many ways of defining
 binary trees.  Mathematically, a \emph{binary tree} is a connected,
 undirected, finite graph with no cycles, and no vertex of degree greater
 than three.