diff --git a/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp b/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp
index c087607c5a..2d793996e7 100644
--- a/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp
+++ b/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.cpp
@@ -194,6 +194,22 @@ Rim3dOverlayInfoConfig::HistogramData Rim3dOverlayInfoConfig::histogramData()
     return HistogramData();
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+inline bool Rim3dOverlayInfoConfig::HistogramData::isValid() const
+{
+    return histogram && histogram->size() > 0 && isValid( min ) && isValid( max );
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+inline bool Rim3dOverlayInfoConfig::HistogramData::isValid( double parameter ) const
+{
+    return parameter != HUGE_VAL && parameter != -HUGE_VAL;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.h b/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.h
index 3159b5b80a..74ccb72ba6 100644
--- a/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.h
+++ b/ApplicationCode/ProjectDataModel/Rim3dOverlayInfoConfig.h
@@ -70,9 +70,9 @@ class Rim3dOverlayInfoConfig : public caf::PdmObject
         double                     sum;
         double                     weightedMean;
         const std::vector<size_t>* histogram;
-        bool isValid( double parameter ) const { return parameter != HUGE_VAL && parameter != -HUGE_VAL; }
 
-        bool isValid() const { return histogram && histogram->size() > 0 && isValid( min ) && isValid( max ); }
+        bool isValid( double parameter ) const;
+        bool isValid() const;
     };
 
 public: