diff --git a/src/CpintPlot.cpp b/src/CpintPlot.cpp
index 24358f7ee..a8c469b16 100644
--- a/src/CpintPlot.cpp
+++ b/src/CpintPlot.cpp
@@ -33,6 +33,7 @@
 #include "RideFile.h"
 #include "Season.h"
 #include <boost/scoped_ptr.hpp>
+#include <algorithm> // for std::lower_bound
 
 #define USE_T0_IN_CP_MODEL 0 // added djconnel 08Apr2009: allow 3-parameter CP model