diff --git a/ChangeLog b/ChangeLog
index 38b2a4a1bc..dd51b18227 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Aug 13 13:50:59 2003  NAKAMURA Usaku <usa@ruby-lang.org>
+
+	* ext/Win32API/Win32API.c (Win32API_initialize): should pass some
+	  class to first argument of Data_Wrap_Struct(). (ruby-bugs PR#1109)
+
 Tue Aug 12 16:55:11 2003  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* Makefile.in: static link libraries to LIBRUBY_SO with static linked
diff --git a/ext/Win32API/Win32API.c b/ext/Win32API/Win32API.c
index a33e989d27..776df56ecb 100644
--- a/ext/Win32API/Win32API.c
+++ b/ext/Win32API/Win32API.c
@@ -53,7 +53,7 @@ Win32API_initialize(self, dllname, proc, import, export)
     hdll = LoadLibrary(RSTRING(dllname)->ptr);
     if (!hdll)
 	rb_raise(rb_eRuntimeError, "LoadLibrary: %s\n", RSTRING(dllname)->ptr);
-    rb_iv_set(self, "__hdll__", Data_Wrap_Struct(self, 0, Win32API_FreeLibrary, hdll));
+    rb_iv_set(self, "__hdll__", Data_Wrap_Struct(rb_cData, 0, Win32API_FreeLibrary, hdll));
     hproc = GetProcAddress(hdll, RSTRING(proc)->ptr);
     if (!hproc) {
 	str = rb_str_new3(proc);