diff --git a/package/busybox/Makefile b/package/busybox/Makefile
index 2ac67098f7..c61e3f4781 100644
--- a/package/busybox/Makefile
+++ b/package/busybox/Makefile
@@ -21,7 +21,7 @@ PKG_BUILD_PARALLEL:=1
 include $(INCLUDE_DIR)/package.mk
 
 ifeq ($(DUMP),)
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell grep '^CONFIG_BUSYBOX_' $(TOPDIR)/.config | md5s)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell $(SH_FUNC) grep '^CONFIG_BUSYBOX_' $(TOPDIR)/.config | md5s)
 endif
 
 init-y :=