diff --git a/tools/build.sh b/tools/build.sh
index 5b029d6..d9c9bfc 100755
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -47,7 +47,7 @@ if [ ! -d "/package/pkg/$PKG" ]; then
 	log_cmd chown build:build "/pkg/$PKG"
 fi
 
-if [ "$(stat -c %U "/pkg/$PKG")" != "build" ] && [ -z "$opt_purge" ] ; then
+if [ "$(stat -c %U "/pkg/$PKG/.")" != "build" ] && [ -z "$opt_purge" ] ; then
 	echo "/pkg/$PKG is no longer owned by build user"
 	echo "rerun with --purge if you want to build from scratch"
 	exit 1