diff --git a/Code/Fusion/otbSimpleRcsPanSharpeningFusionImageFilter.txx b/Code/Fusion/otbSimpleRcsPanSharpeningFusionImageFilter.txx
index f3ad2ee91245f5de16de2e006ae6821cb3eba883..3afba841fec6b95c2b8e101ceacec146c819ab97 100644
--- a/Code/Fusion/otbSimpleRcsPanSharpeningFusionImageFilter.txx
+++ b/Code/Fusion/otbSimpleRcsPanSharpeningFusionImageFilter.txx
@@ -33,6 +33,7 @@ namespace otb
   {
     this->SetNumberOfRequiredInputs(2);
     m_ConvolutionFilter = ConvolutionFilterType::New();
+    m_ConvolutionFilter->NormalizeFilterOn();
     m_DivideFilter = DivideFilterType::New();
     m_MultiplyFilter = MultiplyFilterType::New();