diff --git a/Code/Mantid/Framework/DataHandling/src/SaveANSTOAscii.cpp b/Code/Mantid/Framework/DataHandling/src/SaveANSTOAscii.cpp
index 5f8b3d97657a..b680fba6eab5 100644
--- a/Code/Mantid/Framework/DataHandling/src/SaveANSTOAscii.cpp
+++ b/Code/Mantid/Framework/DataHandling/src/SaveANSTOAscii.cpp
@@ -17,6 +17,7 @@
 #include <fstream>
 #include <boost/tokenizer.hpp>
 #include <boost/regex.hpp>
+#include <boost/math/special_functions/fpclassify.hpp>
 
 namespace Mantid
 {