diff --git a/src/AIS/AIS_DiameterDimension.cxx b/src/AIS/AIS_DiameterDimension.cxx
index 8d8c872ed7..dd220f4599 100755
--- a/src/AIS/AIS_DiameterDimension.cxx
+++ b/src/AIS/AIS_DiameterDimension.cxx
@@ -327,7 +327,7 @@ void AIS_DiameterDimension::ComputeOneFaceDiameter(
 
   gp_Pln aPln;
   Handle( Geom_Surface ) aBasisSurf;
-  AIS_KindOfSurface aSurfType;
+  AIS_KindOfSurface aSurfType = AIS_KOS_OtherSurface;
   Standard_Real Offset;
   if( myAutomaticPosition )
     AIS::GetPlaneFromFace( TopoDS::Face(  myFShape),