diff --git a/ApplicationCode/ReservoirDataModel/RigStatistics.h b/ApplicationCode/ReservoirDataModel/RigStatistics.h
index 9ee3379694..716bc36098 100644
--- a/ApplicationCode/ReservoirDataModel/RigStatistics.h
+++ b/ApplicationCode/ReservoirDataModel/RigStatistics.h
@@ -22,9 +22,11 @@
 #include "cvfObject.h"
 #include "cvfCollection.h"
 
-#include <vector>
 #include "RigEclipseCase.h"
 
+#include <vector>
+#include <math.h>
+
 class RigStatisticsEvaluator
 {
 public: