diff --git a/src/subroutines.f90 b/src/subroutines.f90
index ae15a65..9fd159c 100644
--- a/src/subroutines.f90
+++ b/src/subroutines.f90
@@ -194,11 +194,12 @@ module subroutines
             pos = box_bd(2*i) - pos
         else if ((index(pos_string,'+') > 0).and.(index(pos_string,'inf')>0)) then 
             !Now extract the number we are reducing from infinity
-           if(index(pos_string,'inf') < index(pos_string,'-')) then 
+           if(index(pos_string,'inf') < index(pos_string,'+')) then 
                 read(pos_string(index(pos_string,'+')+1:), *, iostat=iospara) pos
             else
                 read(pos_string(1:index(pos_string,'+')-1), *, iostat=iospara) pos
             end if
+            pos = box_bd(2*i-1) + pos
         else if ((index(pos_string,'*') > 0).and.(index(pos_string,'inf')>0)) then 
             !Now extract the number we are reducing from infinity
            if(index(pos_string,'inf') < index(pos_string,'*')) then 
@@ -206,7 +207,7 @@ module subroutines
             else
                 read(pos_string(1:index(pos_string,'*')-1), *, iostat=iospara) pos
             end if
-            pos = (box_bd(2*i)-box_bd(2*i-1))*pos
+            pos = (box_bd(2*i)-box_bd(2*i-1))*pos + box_bd(2*i-1)
         else
             read(pos_string, *, iostat=iospara) pos
         end if