--- a/b2g/moz.build
+++ b/b2g/moz.build
@@ -3,15 +3,15 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 CONFIGURE_SUBST_FILES += ['installer/Makefile']
 
 DIRS += ['chrome', 'components', 'locales']
 
 if CONFIG['OS_ARCH'] == 'WINNT':
-    DIRS += ['/xulrunner/tools/redit']
+    DIRS += ['../xulrunner/tools/redit']
 
 if CONFIG['GAIADIR']:
     DIRS += ['gaia']
 
 DIRS += ['app']