diff --git a/src/CurveCreator/CurveCreator_Curve.hxx b/src/CurveCreator/CurveCreator_Curve.hxx
index b7e9bcfde..878072f0e 100644
--- a/src/CurveCreator/CurveCreator_Curve.hxx
+++ b/src/CurveCreator/CurveCreator_Curve.hxx
@@ -233,7 +233,7 @@ public:
   //! A virtual method.
   const CurveCreator_ISection* getSection(const int theSectionIndex) const
   {
-    if (theSectionIndex >= 0 && theSectionIndex < mySections.size())
+    if (theSectionIndex >= 0 && theSectionIndex < (int)mySections.size())
     {
       return (CurveCreator_ISection*)mySections[theSectionIndex];
     }