diff --git a/package/pkg-kconfig.mk b/package/pkg-kconfig.mk
index 6bf3d6b4be..684342bcef 100644
--- a/package/pkg-kconfig.mk
+++ b/package/pkg-kconfig.mk
@@ -301,6 +301,7 @@ endif
 # defconfig + fragments (if any) and the current configuration.
 # Note: it preserves the timestamp of the current configuration when moving it
 # around.
+$(1)-diff-config: PKG=$(2)
 $(1)-diff-config: $(1)-check-configuration-done
 	$$(Q)cp -a $$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG) $$($(2)_DIR)/.config.dc.bak
 	$$(call kconfig-package-merge-config,$(2),$$($(2)_DIR)/$$($(2)_KCONFIG_DOTCONFIG),\