diff --git a/src/transmissionReconstruction/reconstruction/reconstruction.cpp b/src/transmissionReconstruction/reconstruction/reconstruction.cpp
index 40a7cd4..ee4c0ce 100644
--- a/src/transmissionReconstruction/reconstruction/reconstruction.cpp
+++ b/src/transmissionReconstruction/reconstruction/reconstruction.cpp
@@ -80,7 +80,7 @@ namespace Recon {
     
     Matrix slownessToSOS(Aurora::Matrix & aVF1, double aSOS_IN_WATER)
     {
-        return 1 / ((aVF1 + 1) / aSOS_IN_WATER);
+        return 1 / (aVF1 + 1 / aSOS_IN_WATER);
     }
     
     DiscretizePositionValues discretizePositions(Aurora::Matrix &aVSenderCoordList, Aurora::Matrix &aVReceiverCoordList, double aNumPixelXY)