--- hdf5-1.6.5/src/H5R.c.memset	2005-08-20 13:28:52.000000000 -0600
+++ hdf5-1.6.5/src/H5R.c	2007-08-08 09:40:01.000000000 -0600
@@ -190,7 +190,7 @@
             } /* end if */
 
             /* Zero the heap ID out, may leak heap space if user is re-using reference and doesn't have garbage collection on */
-            HDmemset(ref,H5R_DSET_REG_REF_BUF_SIZE,0);
+            HDmemset(ref,0,H5R_DSET_REG_REF_BUF_SIZE);
 
             /* Get the amount of space required to serialize the selection */
             if ((buf_size = H5S_SELECT_SERIAL_SIZE(space)) < 0)