diff --git a/package/ifxmips-dsl-api/Makefile b/package/ifxmips-dsl-api/Makefile
index a62caef6fd..f34932e39b 100644
--- a/package/ifxmips-dsl-api/Makefile
+++ b/package/ifxmips-dsl-api/Makefile
@@ -19,7 +19,7 @@ PKG_SOURCE_URL:=http://mirror2.openwrt.org/sources/
 PKG_MD5SUM:=c45bc531c1ed2ac80f68fb986b63bb87
 
 ifeq ($(DUMP),)
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell grep '^CONFIG_IFXMIPS_DSL_' $(TOPDIR)/.config | md5s)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell $(SH_FUNC) grep '^CONFIG_IFXMIPS_DSL_' $(TOPDIR)/.config | md5s)
 endif
 
 FW_BASE_NAME:=dsl_danube_firmware_adsl
diff --git a/package/uboot-lantiq/Makefile b/package/uboot-lantiq/Makefile
index 8b69fe9509..089802e427 100644
--- a/package/uboot-lantiq/Makefile
+++ b/package/uboot-lantiq/Makefile
@@ -22,7 +22,7 @@ PKG_TARGETS:=bin
 include $(INCLUDE_DIR)/package.mk
 
 ifeq ($(DUMP),)
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell grep '^CONFIG_UBOOT_' $(TOPDIR)/.config | md5s)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell $(SH_FUNC) grep '^CONFIG_UBOOT_' $(TOPDIR)/.config | md5s)
 endif
 
 define Package/uboot-lantiq