diff --git a/Code/BasicFilters/otbBCOInterpolateImageFunction.txx b/Code/BasicFilters/otbBCOInterpolateImageFunction.txx
index a259834a13da20fb0753161500abc8b2b0053ac0..df4245995b4073d8550a53c8b6f3a79d559d346b 100644
--- a/Code/BasicFilters/otbBCOInterpolateImageFunction.txx
+++ b/Code/BasicFilters/otbBCOInterpolateImageFunction.txx
@@ -181,7 +181,7 @@ BCOInterpolateImageFunction<TInputImage, TCoordRep>
     value += lineRes[i+radius]*BCOCoefX[i+radius];
     }
 
-  norma = (vcl_log(radius)/vcl_log(2.0));
+  norma = (vcl_log(static_cast<double>(radius))/vcl_log(2.0));
   norma = norma * norma;
 
   return ( static_cast<OutputType>( value/norma ) );