diff --git a/ApplicationCode/GeoMech/OdbReader/RifGeoMechReaderInterface.h b/ApplicationCode/GeoMech/OdbReader/RifGeoMechReaderInterface.h
index 70e2221bfb..e412953647 100644
--- a/ApplicationCode/GeoMech/OdbReader/RifGeoMechReaderInterface.h
+++ b/ApplicationCode/GeoMech/OdbReader/RifGeoMechReaderInterface.h
@@ -41,7 +41,7 @@ public:
     RifGeoMechReaderInterface();
     virtual ~RifGeoMechReaderInterface();
 
-    virtual bool                                             openFile(const std::string& fileName, std::string* errorMessage = 0) = 0;
+    virtual bool                                             openFile(const std::string& fileName, std::string* errorMessage) = 0;
 
     virtual bool                                             readFemParts(RigFemPartCollection* geoMechCase) = 0;
     virtual std::vector<std::string>                         stepNames() = 0;
diff --git a/ApplicationCode/GeoMech/OdbReader/RifOdbReader.h b/ApplicationCode/GeoMech/OdbReader/RifOdbReader.h
index 6a58188e46..f1e92748a7 100644
--- a/ApplicationCode/GeoMech/OdbReader/RifOdbReader.h
+++ b/ApplicationCode/GeoMech/OdbReader/RifOdbReader.h
@@ -40,7 +40,7 @@ public:
     RifOdbReader();
     virtual ~RifOdbReader();
 
-	virtual bool                                                openFile(const std::string& fileName, std::string* errorMessage = 0);
+	virtual bool                                                openFile(const std::string& fileName, std::string* errorMessage);
 
     virtual bool                                                readFemParts(RigFemPartCollection* geoMechCase);
     virtual std::vector<std::string>                            stepNames();