diff --git a/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinement.C b/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinement.C
index 0c5945f464..738a5cced3 100644
--- a/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinement.C
+++ b/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinement.C
@@ -216,8 +216,8 @@ void Foam::meshRefinement::updateIntersections(const labelList& changedFaces)
     // Extend segments a bit
     {
         const vectorField smallVec(Foam::sqrt(SMALL)*(end-start));
-        start += smallVec;
-        end -= smallVec;
+        start -= smallVec;
+        end += smallVec;
     }
 
 
@@ -327,8 +327,8 @@ void Foam::meshRefinement::checkData()
         // Extend segments a bit
         {
             const vectorField smallVec(Foam::sqrt(SMALL)*(end-start));
-            start += smallVec;
-            end -= smallVec;
+            start -= smallVec;
+            end += smallVec;
         }
 
 
@@ -2266,8 +2266,8 @@ void Foam::meshRefinement::dumpIntersections(const fileName& prefix) const
         // Extend segments a bit
         {
             const vectorField smallVec(Foam::sqrt(SMALL)*(end-start));
-            start += smallVec;
-            end -= smallVec;
+            start -= smallVec;
+            end += smallVec;
         }
 
 
diff --git a/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementBaffles.C b/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementBaffles.C
index 8f8a532e2c..f3ab1e65c9 100644
--- a/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementBaffles.C
+++ b/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementBaffles.C
@@ -286,8 +286,8 @@ void Foam::meshRefinement::getBafflePatches
     // Extend segments a bit
     {
         const vectorField smallVec(Foam::sqrt(SMALL)*(end-start));
-        start += smallVec;
-        end -= smallVec;
+        start -= smallVec;
+        end += smallVec;
     }
 
 
@@ -2457,8 +2457,8 @@ Foam::autoPtr<Foam::mapPolyMesh> Foam::meshRefinement::zonify
         // Extend segments a bit
         {
             const vectorField smallVec(Foam::sqrt(SMALL)*(end-start));
-            start += smallVec;
-            end -= smallVec;
+            start -= smallVec;
+            end += smallVec;
         }
 
 
diff --git a/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementRefine.C b/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementRefine.C
index 96821d4718..a7cc79ee7a 100644
--- a/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementRefine.C
+++ b/src/mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinementRefine.C
@@ -629,8 +629,8 @@ Foam::label Foam::meshRefinement::markSurfaceRefinement
     // Extend segments a bit
     {
         const vectorField smallVec(Foam::sqrt(SMALL)*(end-start));
-        start += smallVec;
-        end -= smallVec;
+        start -= smallVec;
+        end += smallVec;
     }
 
 
@@ -845,8 +845,8 @@ Foam::label Foam::meshRefinement::markSurfaceCurvatureRefinement
     // Extend segments a bit
     {
         const vectorField smallVec(Foam::sqrt(SMALL)*(end-start));
-        start += smallVec;
-        end -= smallVec;
+        start -= smallVec;
+        end += smallVec;
     }