diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index 03c76c717a..9dc1f2a947 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -361,7 +361,7 @@ git filter-branch --index-filter \
 	'git ls-files -s | sed "s-\t\"*-&newsubdir/-" |
 		GIT_INDEX_FILE=$GIT_INDEX_FILE.new \
 			git update-index --index-info &&
-	 mv $GIT_INDEX_FILE.new $GIT_INDEX_FILE' HEAD
+	 mv "$GIT_INDEX_FILE.new" "$GIT_INDEX_FILE"' HEAD
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