:

diff --git a/Makefile b/Makefile
index 93d7fbc2f732df95ab474c060c284c72beedddda..58679fa4ec4d06f25d01552fff51cd2500966895 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ build: ensure
 book: build
 
 deploy: book
-       @git branch -r | grep gh-pages && git push origin :gh-pages || true
+       @(git branch -r | grep gh-pages && git push origin :gh-pages) || true
        @git add -f book
        @git commit -m "add book"
        @git subtree push --prefix book origin gh-pages