diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 69e6fc68b31..6c8b627969a 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,8 @@
 Sun May 17 12:32:08 1998  Jason Merrill  <jason@yorick.cygnus.com>
 
+	* decl.c (duplicate_decls): Use CANONICAL_TYPE_VARIANT to compare
+	old and new types.
+
 	* pt.c (tsubst): Make sure that BINFO_TYPE of new binfos is the
 	canonical type.
 
diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 9d409e3620d..1ab0922a28d 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -2926,7 +2926,7 @@ duplicate_decls (newdecl, olddecl)
       TREE_TYPE (newdecl) = TREE_TYPE (olddecl) = newtype;
 
       /* Lay the type out, unless already done.  */
-      if (oldtype != TREE_TYPE (newdecl)
+      if (newtype != CANONICAL_TYPE_VARIANT (oldtype)
 	  && TREE_TYPE (newdecl) != error_mark_node
 	  && !(processing_template_decl && uses_template_parms (newdecl)))
 	layout_type (TREE_TYPE (newdecl));