diff --git a/Modules/Adapters/OSSIMAdapters/src/otbFilterFunctionValues.cxx b/Modules/Adapters/OSSIMAdapters/src/otbFilterFunctionValues.cxx
index 51fad9e99cbb2590642cdb01b9741435b064895e..4a5965cd144b640f244284025e7ab915c1fbdc07 100644
--- a/Modules/Adapters/OSSIMAdapters/src/otbFilterFunctionValues.cxx
+++ b/Modules/Adapters/OSSIMAdapters/src/otbFilterFunctionValues.cxx
@@ -53,7 +53,7 @@ FilterFunctionValues
     total2 += m_FilterFunctionValues6S[centerIndex];
     if (total2 > total / 2) break;
     }
-  return m_MinSpectralValue + m_UserStep * centerIndex;
+  return m_MinSpectralValue + 0.0025 * centerIndex;
 }
 
 /**PrintSelf method */