diff --git a/ApplicationCode/ReservoirDataModel/RigWeightedMeanCalc.cpp b/ApplicationCode/ReservoirDataModel/RigWeightedMeanCalc.cpp
index 903d6ea34a..4530e18380 100644
--- a/ApplicationCode/ReservoirDataModel/RigWeightedMeanCalc.cpp
+++ b/ApplicationCode/ReservoirDataModel/RigWeightedMeanCalc.cpp
@@ -23,6 +23,8 @@
 #include "RigActiveCellInfo.h"
 #include "RigFlowDiagResults.h"
 
+#include <cmath> // Needed for HUGE_VAL on Linux
+
 //--------------------------------------------------------------------------------------------------
 /// 
 //--------------------------------------------------------------------------------------------------