diff --git a/src/symba/symba_io.f90 b/src/symba/symba_io.f90
index 06472aae9..1c0981232 100644
--- a/src/symba/symba_io.f90
+++ b/src/symba/symba_io.f90
@@ -278,7 +278,7 @@ module subroutine symba_io_read_particle(system, param)
                      lmatch = .false.
                      read(LUN, err = 667, iomsg = errmsg, end = 333) id
 
-                     if (idx == cb%id) then
+                     if (id == cb%id) then
                         read(LUN, err = 667, iomsg = errmsg) cb%info
                         lmatch = .true.
                      else