diff --git a/rules.mk b/rules.mk
index a84636a21b3bd0799c3eeb1fb734f818cd982e2a..c9efb9e8c9e29595845eeceb2cc95664b39aeea8 100644
--- a/rules.mk
+++ b/rules.mk
@@ -269,6 +269,9 @@ ifeq ($(CONFIG_BUILD_LOG),y)
   BUILD_LOG:=1
 endif
 
+export BISON_PKGDATADIR:=$(STAGING_DIR_HOST)/share/bison
+export M4:=$(STAGING_DIR_HOST)/bin/m4
+
 define shvar
 V_$(subst .,_,$(subst -,_,$(subst /,_,$(1))))
 endef