diff --git a/include/download.mk b/include/download.mk
index ec55777238ebad464a172e94a47cd503e9c0da12..095311bfbdee6194a5b1d2ea2c6131bc1de6c379 100644
--- a/include/download.mk
+++ b/include/download.mk
@@ -171,7 +171,7 @@ define Download/Defaults
   URL_FILE:=
   PROTO:=
   HASH=$$(MD5SUM)
-  MD5SUM:=
+  MD5SUM:=x
   SUBDIR:=
   MIRROR:=1
   MIRROR_HASH=$$(MIRROR_MD5SUM)
diff --git a/include/package.mk b/include/package.mk
index 87dc5730884714dc6fda5b532cdbff50f38304f7..26fc30c7ec40cf81eaff90c46da4ae8608db9eb6 100644
--- a/include/package.mk
+++ b/include/package.mk
@@ -11,7 +11,6 @@ all: $(if $(DUMP),dumpinfo,compile)
 
 PKG_BUILD_DIR ?= $(BUILD_DIR)/$(PKG_NAME)$(if $(PKG_VERSION),-$(PKG_VERSION))
 PKG_INSTALL_DIR ?= $(PKG_BUILD_DIR)/ipkg-install
-PKG_MD5SUM ?= unknown
 PKG_BUILD_PARALLEL ?=
 PKG_USE_MIPS16 ?= 1
 PKG_IREMAP ?= 1