diff --git a/ApplicationCode/FileInterface/RifDerivedEnsembleReader.cpp b/ApplicationCode/FileInterface/RifDerivedEnsembleReader.cpp
index bf8d460572..839bfa1f92 100644
--- a/ApplicationCode/FileInterface/RifDerivedEnsembleReader.cpp
+++ b/ApplicationCode/FileInterface/RifDerivedEnsembleReader.cpp
@@ -20,8 +20,10 @@
 
 #include "RimDerivedEnsembleCase.h"
 
-
-static const std::vector<time_t> EMPTY_TIME_STEPS_VECTOR;
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+const std::vector<time_t> RifDerivedEnsembleReader::EMPTY_TIME_STEPS_VECTOR;
 
 //--------------------------------------------------------------------------------------------------
 /// 
diff --git a/ApplicationCode/FileInterface/RifDerivedEnsembleReader.h b/ApplicationCode/FileInterface/RifDerivedEnsembleReader.h
index 39a10dc7bf..21bb7b2d61 100644
--- a/ApplicationCode/FileInterface/RifDerivedEnsembleReader.h
+++ b/ApplicationCode/FileInterface/RifDerivedEnsembleReader.h
@@ -30,6 +30,8 @@ class RimDerivedEnsembleCase;
 //==================================================================================================
 class RifDerivedEnsembleReader : public RifSummaryReaderInterface
 {
+    static const std::vector<time_t> EMPTY_TIME_STEPS_VECTOR;
+
 public:
     RifDerivedEnsembleReader(RimDerivedEnsembleCase* derivedCase);
 
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.cpp b/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.cpp
index 902f4fa907..24731c0c6d 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.cpp
+++ b/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.cpp
@@ -40,8 +40,8 @@ CAF_PDM_ABSTRACT_SOURCE_INIT(RimDerivedEnsembleCase, "RimDerivedEnsembleCase");
 //--------------------------------------------------------------------------------------------------
 /// 
 //--------------------------------------------------------------------------------------------------
-static const std::vector<time_t> EMPTY_TIME_STEPS_VECTOR;
-static const std::vector<double> EMPTY_VALUES_VECTOR;
+const std::vector<time_t> RimDerivedEnsembleCase::EMPTY_TIME_STEPS_VECTOR;
+const std::vector<double> RimDerivedEnsembleCase::EMPTY_VALUES_VECTOR;
 
 //--------------------------------------------------------------------------------------------------
 /// 
diff --git a/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.h b/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.h
index 379e385f9b..5105a60a59 100644
--- a/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.h
+++ b/ApplicationCode/ProjectDataModel/Summary/RimDerivedEnsembleCase.h
@@ -46,6 +46,10 @@ enum DerivedEnsembleOperator
 class RimDerivedEnsembleCase : public RimSummaryCase
 {
     CAF_PDM_HEADER_INIT;
+
+    static const std::vector<time_t> EMPTY_TIME_STEPS_VECTOR;
+    static const std::vector<double> EMPTY_VALUES_VECTOR;
+
 public:
     RimDerivedEnsembleCase();
     ~RimDerivedEnsembleCase();