diff --git a/sources/io.F90 b/sources/io.F90
index 79a70c6..26a869e 100644
--- a/sources/io.F90
+++ b/sources/io.F90
@@ -2027,7 +2027,7 @@ module io
 
 ! prepare and store metablocks
 !
-      allocate(fields(nm,14), children(nm,nc), bounds(nm,3,2),                 &
+      allocate(fields(nm,14), children(nm,nc), bounds(nm,NDIMS,2),             &
 #if NDIMS == 3
                faces(nm,NDIMS,ns,ns,ns),                                       &
                edges(nm,NDIMS,ns,ns,ns), corners(nm,ns,ns,ns),                 &