diff --git a/dll/win32/msi/msi_ros.diff b/dll/win32/msi/msi_ros.diff
index 7198d57b507..3d153bb231e 100644
--- a/dll/win32/msi/msi_ros.diff
+++ b/dll/win32/msi/msi_ros.diff
@@ -197,10 +197,9 @@ Index: D:/trunk/dll/win32/msi/msvchelper.h
 ===================================================================
 --- D:/trunk/dll/win32/msi/msvchelper.h	(revision 0)
 +++ D:/trunk/dll/win32/msi/msvchelper.h	(revision 51711)
-@@ -0,0 +1,13 @@
+@@ -0,0 +1,12 @@
 +
 +#ifdef __i386__
-+#define __ASM_DEFINE_FUNC(name,suffix,code)
 +
 +typedef unsigned int (__stdcall *__MSVC__MsiCustomActionEntryPoint)(unsigned int);
 +
diff --git a/dll/win32/msi/msvchelper.h b/dll/win32/msi/msvchelper.h
index 26a6266be69..0ad6d72308d 100644
--- a/dll/win32/msi/msvchelper.h
+++ b/dll/win32/msi/msvchelper.h
@@ -1,6 +1,5 @@
 
 #ifdef __i386__
-#define __ASM_DEFINE_FUNC(name,suffix,code)
 
 typedef unsigned int (__stdcall *__MSVC__MsiCustomActionEntryPoint)(unsigned int);