diff --git a/src/manip.cpp b/src/manip.cpp
index 50ae50b3dad3ca583c431dd1e891cc8802f902ce..d3b49850955f494c4531225d8a3368416d9733d6 100644
--- a/src/manip.cpp
+++ b/src/manip.cpp
@@ -624,7 +624,7 @@ void NManip::ScaAvge(void)
             for( uint iz=0; iz<nz; ++iz ){
                 uint mz = 0;
                 double z = 0;
-                for (uint jj=ji+1; jj<jf; jj++) {
+                for (uint jj=ji; jj<jf; jj++) {
                     z += fin->VS[jj].z[iz];
                     ++mz;
                 }