diff --git a/ChangeLog b/ChangeLog
index 2f3cb86779..99b7b0bfef 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Oct  2 05:32:17 2014  Eric Wong  <e@80x24.org>
+
+	* io.c (fptr_finalize): free memory before GC sweep
+	  [ruby-core:65269] [Feature #10295]
+
 Thu Oct  2 05:27:24 2014  Eric Wong  <e@80x24.org>
 
 	* marshal.c (w_class): check dump_arg->compat_tbl before lookup
diff --git a/io.c b/io.c
index 876ae675a4..f4b41dd21a 100644
--- a/io.c
+++ b/io.c
@@ -4251,6 +4251,9 @@ maygvl_fclose(FILE *file, int keepgvl)
     return (int)(intptr_t)rb_thread_call_without_gvl(nogvl_fclose, file, RUBY_UBF_IO, 0);
 }
 
+static void free_io_buffer(rb_io_buffer_t *buf);
+static void clear_codeconv(rb_io_t *fptr);
+
 static void
 fptr_finalize(rb_io_t *fptr, int noraise)
 {
@@ -4312,6 +4315,9 @@ fptr_finalize(rb_io_t *fptr, int noraise)
             rb_exc_raise(err);
         }
     }
+    free_io_buffer(&fptr->rbuf);
+    free_io_buffer(&fptr->wbuf);
+    clear_codeconv(fptr);
 }
 
 static void