diff --git a/ms-windows/osgeo4w/package-nightly.cmd b/ms-windows/osgeo4w/package-nightly.cmd
index 08f19769d1e..706d5508f99 100644
--- a/ms-windows/osgeo4w/package-nightly.cmd
+++ b/ms-windows/osgeo4w/package-nightly.cmd
@@ -13,7 +13,7 @@ REM *   (at your option) any later version.                                   *
 REM *                                                                         *
 REM ***************************************************************************
 @echo off
-set GRASS_VERSION=6.4.3RC3
+set GRASS_VERSION=6.4.3RC4
 
 set BUILDDIR=%CD%\build
 REM set BUILDDIR=%TEMP%\qgis_unstable
diff --git a/ms-windows/osgeo4w/package.cmd b/ms-windows/osgeo4w/package.cmd
index 3e36b9a71e3..39d38b5632c 100644
--- a/ms-windows/osgeo4w/package.cmd
+++ b/ms-windows/osgeo4w/package.cmd
@@ -13,7 +13,7 @@ REM *   (at your option) any later version.                                   *
 REM *                                                                         *
 REM ***************************************************************************
 @echo off
-set GRASS_VERSION=6.4.3RC3
+set GRASS_VERSION=6.4.3RC4
 
 set BUILDDIR=%CD%\build
 REM set BUILDDIR=%TEMP%\qgis_unstable