diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 1326f85..0f5093d 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -568,7 +568,7 @@ address_space_int_to_name (struct gdbarch *gdbarch, int space_flag)
    If STORAGE is non-NULL, create the new type instance there.
    STORAGE must be in the same obstack as TYPE.  */
 
-static struct type *
+struct type *
 make_qualified_type (struct type *type, int new_flags,
 		     struct type *storage)
 {
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index bd1a0ab..80ed725 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -1647,6 +1647,9 @@ extern int address_space_name_to_int (struct gdbarch *, char *);
 
 extern const char *address_space_int_to_name (struct gdbarch *, int);
 
+extern struct type *make_qualified_type (struct type *type, int new_flags,
+					 struct type *storage);
+
 extern struct type *make_type_with_address_space (struct type *type, 
 						  int space_identifier);
 
diff --git a/gdb/gnu-v3-abi.c b/gdb/gnu-v3-abi.c
index d5ed355..a79a6a9 100644
--- a/gdb/gnu-v3-abi.c
+++ b/gdb/gnu-v3-abi.c
@@ -1313,11 +1313,19 @@ gnuv3_pass_by_reference (struct type *type)
 
 	/* If this method takes two arguments, and the second argument is
 	   a reference to this class, then it is a copy constructor.  */
-	if (TYPE_NFIELDS (fieldtype) == 2
-	    && TYPE_CODE (TYPE_FIELD_TYPE (fieldtype, 1)) == TYPE_CODE_REF
-	    && check_typedef (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (fieldtype,
-								 1))) == type)
-	  return 1;
+	if (TYPE_NFIELDS (fieldtype) == 2)
+	  {
+	    struct type *arg_type = TYPE_FIELD_TYPE (fieldtype, 1);
+	    struct type *arg_target_type;
+	    int flags;
+
+	    arg_target_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
+	    flags = TYPE_INSTANCE_FLAGS (arg_target_type);
+
+	    if (TYPE_CODE (arg_type) == TYPE_CODE_REF
+		&& arg_target_type == make_qualified_type (type, flags, NULL))
+	      return 1;
+	  }
       }
 
   /* Even if all the constructors and destructors were artificial, one