diff --git a/build b/build
index 3408b745..6831c781 100755
--- a/build
+++ b/build
@@ -100,7 +100,7 @@ build_release()
 	cd "$srcdir" || $err "$vdir: !cd \"$srcdir\""
 	./update trees -f
 	rmgit .
-	x_ rm -Rf cache
+	x_ rm -Rf cache tmp
 	x_ mv src/docs docs
 	) || $err "can't create release files"