diff --git a/src/io.f90 b/src/io.f90
index a7947a5..aab20c9 100644
--- a/src/io.f90
+++ b/src/io.f90
@@ -890,6 +890,9 @@ module io
         read(11,*) textholder
         read(11,*) in_atoms
 
+
+        call grow_ele_arrays(in_eles-ele_num, in_atoms-atom_num)
+
         !read in atom masses
         read(11, *) textholder
         read(11, '(a)') textholder