diff --git a/browser/locales/Makefile.in b/browser/locales/Makefile.in
index 6b38922de48..13449630e7d 100644
--- a/browser/locales/Makefile.in
+++ b/browser/locales/Makefile.in
@@ -127,14 +127,14 @@ libs:: $(call MERGE_FILES,$(addprefix profile/chrome/,$(PROFILE_CHROME)))
 
 libs-%:
 	$(NSINSTALL) -D $(DIST)/install
-	@$(MAKE) -C ../../toolkit/locales libs-$* XPI_ROOT_APPID=$(XPI_ROOT_APPID)
+	@$(MAKE) -C ../../toolkit/locales libs-$* XPI_ROOT_APPID='$(XPI_ROOT_APPID)'
 	@$(MAKE) -C ../../services/sync/locales AB_CD=$* XPI_NAME=locale-$*
 ifdef MOZ_WEBAPP_RUNTIME
 	@$(MAKE) -C ../../webapprt/locales AB_CD=$* XPI_NAME=locale-$*
 endif
 	@$(MAKE) -C ../../extensions/spellcheck/locales AB_CD=$* XPI_NAME=locale-$*
 	@$(MAKE) -C ../../intl/locales AB_CD=$* XPI_NAME=locale-$*
-	@$(MAKE) -C ../../devtools/client/locales AB_CD=$* XPI_NAME=locale-$* XPI_ROOT_APPID=$(XPI_ROOT_APPID)
+	@$(MAKE) -C ../../devtools/client/locales AB_CD=$* XPI_NAME=locale-$* XPI_ROOT_APPID='$(XPI_ROOT_APPID)'
 	@$(MAKE) -B searchplugins AB_CD=$* XPI_NAME=locale-$*
 	@$(MAKE) libs AB_CD=$* XPI_NAME=locale-$* PREF_DIR=$(PREF_DIR)
 	@$(MAKE) -C $(DEPTH)/$(MOZ_BRANDING_DIRECTORY)/locales AB_CD=$* XPI_NAME=locale-$*