diff --git a/indra/llmath/llcalcparser.h b/indra/llmath/llcalcparser.h
index 608010508ce7292b0499757b772a373aa392c861..4b615263d5e8364922cc1c868583bca868cd54a1 100644
--- a/indra/llmath/llcalcparser.h
+++ b/indra/llmath/llcalcparser.h
@@ -34,8 +34,7 @@
 
 // Add this in if we want boost math constants.
 #include <boost/bind.hpp>
-//#include <boost/math/constants/constants.hpp>
-#include <boost/spirit/include/phoenix.hpp>
+#include <boost/phoenix.hpp>
 #include <boost/spirit/include/qi.hpp>
 
 namespace expression {