diff --git a/src/transmissionReconstruction/reconstruction/buildMatrix/buildMatrix.cpp b/src/transmissionReconstruction/reconstruction/buildMatrix/buildMatrix.cpp
index 932d44a..352b0b8 100644
--- a/src/transmissionReconstruction/reconstruction/buildMatrix/buildMatrix.cpp
+++ b/src/transmissionReconstruction/reconstruction/buildMatrix/buildMatrix.cpp
@@ -315,10 +315,10 @@ namespace Recon
                 i.setBlockValue(1, coeffIndex, cnt-1, rayCount-1);
                 j.setBlock(1,coeffIndex,cnt-1,linearIndices);
                 if (weighting.isScalar()){
-                    s.setBlockValue(1, coeffIndex, cnt,weighting.getScalar());
+                    s.setBlockValue(1, coeffIndex, cnt-1,weighting.getScalar());
                 }
                 else{
-                    s.setBlock(1, coeffIndex, cnt, weighting);
+                    s.setBlock(1, coeffIndex, cnt-1, weighting);
                 }
             }
             else{