diff --git a/include/boost/intrusive/priority_compare.hpp b/include/boost/intrusive/priority_compare.hpp
index 19d4265..9689851 100644
--- a/include/boost/intrusive/priority_compare.hpp
+++ b/include/boost/intrusive/priority_compare.hpp
@@ -23,7 +23,7 @@ namespace intrusive {
 
 template <class T>
 struct priority_compare
-	: public std::binary_function<T, T, bool>
+        : public std::binary_function<T, T, bool>
 {
    bool operator()(const T &val, const T &val2) const
    {