diff --git a/build.sh b/build.sh
index 57990f7..e88c2e5 100755
--- a/build.sh
+++ b/build.sh
@@ -55,6 +55,7 @@ for BUILD_TARGET_LC in $(subst_tgts invariants ${BUILD_TARGETS_META:-world}); do
 		#
 		#
 		#
+		unset PKG_NAME_PARENT;
 		if [ "${PKG_NAME#*_flavour_*}" != "${PKG_NAME}" ]; then
 			PKG_NAME_PARENT="${PKG_NAME%_flavour_*}";
 		elif [ "${ARG_CHECK_UPDATES:-0}" -eq 1 ]\