diff --git a/config/config.mk b/config/config.mk
index b02d9888a93f..65d852d1471c 100644
--- a/config/config.mk
+++ b/config/config.mk
@@ -710,7 +710,7 @@ ifdef LOCALE_MERGEDIR
 MAKE_JARS_FLAGS += --locale-mergedir=$(LOCALE_MERGEDIR)
 endif
 ifdef IS_LANGUAGE_REPACK
-MAKE_JARS_FLAGS += --l10n-base=$(L10NBASEDIR)
+MAKE_JARS_FLAGS += --l10n-base=$(L10NBASEDIR)/$(AB_CD)
 endif
 else
 MAKE_JARS_FLAGS += -c $(LOCALE_SRCDIR)
diff --git a/js/src/config/config.mk b/js/src/config/config.mk
index b02d9888a93f..65d852d1471c 100644
--- a/js/src/config/config.mk
+++ b/js/src/config/config.mk
@@ -710,7 +710,7 @@ ifdef LOCALE_MERGEDIR
 MAKE_JARS_FLAGS += --locale-mergedir=$(LOCALE_MERGEDIR)
 endif
 ifdef IS_LANGUAGE_REPACK
-MAKE_JARS_FLAGS += --l10n-base=$(L10NBASEDIR)
+MAKE_JARS_FLAGS += --l10n-base=$(L10NBASEDIR)/$(AB_CD)
 endif
 else
 MAKE_JARS_FLAGS += -c $(LOCALE_SRCDIR)