diff --git a/src/backend/storage/large_object/inv_api.c b/src/backend/storage/large_object/inv_api.c
index 3cc2864ea7..95ed68d1ba 100644
--- a/src/backend/storage/large_object/inv_api.c
+++ b/src/backend/storage/large_object/inv_api.c
@@ -24,7 +24,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/large_object/inv_api.c,v 1.127 2008/01/01 19:45:52 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/large_object/inv_api.c,v 1.128 2008/03/01 19:26:22 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -516,7 +516,8 @@ inv_write(LargeObjectDesc *obj_desc, const char *buf, int nbytes)
 	struct
 	{
 		bytea		hdr;
-		char		data[LOBLKSIZE];
+		char		data[LOBLKSIZE];	/* make struct big enough */
+		int32		align_it;	/* ensure struct is aligned well enough */
 	}			workbuf;
 	char	   *workb = VARDATA(&workbuf.hdr);
 	HeapTuple	newtup;
@@ -707,7 +708,8 @@ inv_truncate(LargeObjectDesc *obj_desc, int len)
 	struct
 	{
 		bytea		hdr;
-		char		data[LOBLKSIZE];
+		char		data[LOBLKSIZE];	/* make struct big enough */
+		int32		align_it;	/* ensure struct is aligned well enough */
 	}			workbuf;
 	char	   *workb = VARDATA(&workbuf.hdr);
 	HeapTuple	newtup;