diff --git a/fontconfig/bindings.scm b/fontconfig/bindings.scm
index b547e28..29ff6e5 100644
--- a/fontconfig/bindings.scm
+++ b/fontconfig/bindings.scm
@@ -74,6 +74,9 @@ RETURN-TYPE and accept arguments of ARG-TYPES."
 (define fontconfig-pattern-destroy
   (dynamic-func "FcPatternDestroy" (dynamic-link %libfontconfig)))
 
+;; (define-foreign fontconfig-pattern-destroy
+;;   void "FcPatternDestroy" '(*))
+
 (define-foreign fontconfig-pattern-add-string
   int "FcPatternAddString" '(* * *))
 
diff --git a/fontconfig/object-set.scm b/fontconfig/object-set.scm
index 855ba41..8829dd5 100644
--- a/fontconfig/object-set.scm
+++ b/fontconfig/object-set.scm
@@ -24,16 +24,17 @@
             unwrap-object-set
             object-set-add!))
 
-(define-wrapped-pointer-type <object-set>
-  object-set?
-  wrap-object-set unwrap-object-set
-  (lambda (pattern port)
-    (format port "#<object-set>")))
+(define <object-set>
+  (make-record-type '<object-set> '(ptr)))
+(define %make-object-set  (record-constructor <object-set>))
+(define unwrap-object-set (record-accessor <object-set> 'ptr))
+(define (wrap-object-set ptr)
+  (%make-object-set
+   (make-pointer (pointer-address ptr) ffi:fontconfig-object-set-destroy)))
 
 (define (make-object-set)
   (let* ((ptr (ffi:fontconfig-object-set-create))
          (object-set (wrap-object-set ptr)))
-    (set-pointer-finalizer! ptr ffi:fontconfig-object-set-destroy)
     object-set))
 
 (define (object-set-add! os attr)
diff --git a/fontconfig/pattern.scm b/fontconfig/pattern.scm
index 6c0de37..99fafdf 100644
--- a/fontconfig/pattern.scm
+++ b/fontconfig/pattern.scm
@@ -47,10 +47,14 @@
     histing verticallayout autohint outline scalable
     minspace embolden embeddedbitmap decorative))
 
-(define-wrapped-pointer-type <pattern>
-  pattern?
-  wrap-pattern unwrap-pattern
-  (lambda (pattern port) (format port "#<pattern>")))
+(define <pattern>
+  (make-record-type '<pattern> '(ptr)))
+(define %make-pattern  (record-constructor <pattern>))
+(define unwrap-pattern (record-accessor <pattern> 'ptr))
+
+(define (wrap-pattern ptr)
+  (%make-pattern
+   (make-pointer (pointer-address ptr) ffi:fontconfig-pattern-destroy)))
 
 (define symbol->pointer
   (compose string->pointer symbol->string))
@@ -86,7 +90,6 @@
           (if (null-pointer? ptr)
               (error "make-pattern" "failed to create pattern")
               (wrap-pattern ptr))))
-    (set-pointer-finalizer! ptr ffi:fontconfig-pattern-destroy)
     (map (lambda (args)
            (apply (match args
                     (((? bool? attr) value) pattern-add-bool)