--- a/mail/installer/Makefile.in
+++ b/mail/installer/Makefile.in
@@ -10,17 +10,17 @@ include $(moztopsrcdir)/config/rules.mk
 MOZ_PKG_REMOVALS = $(srcdir)/removed-files.in
 
 MOZ_PKG_MANIFEST_P = $(srcdir)/package-manifest.in
 # Some files have been already bundled with xulrunner
 ifndef SYSTEM_LIBXUL
 MOZ_PKG_FATAL_WARNINGS = 1
 endif
 
-DEFINES += -DPKG_LOCALE_MANIFEST=$(topobjdir)/mail/installer/locale-manifest.in
+DEFINES += -DPKG_LOCALE_MANIFEST=$(commtopobjdir)/mail/installer/locale-manifest.in
 MOZ_CHROME_LOCALE_ENTRIES=@RESPATH@/chrome/
 
 MOZ_PKG_DUPEFLAGS = \
 	-f $(srcdir)/allowed-dupes.mn \
 	-f $(moztopsrcdir)/browser/installer/allowed-dupes.mn \
 	$(NULL)
 
 MOZ_NONLOCALIZED_PKG_LIST = \