diff --git a/git-tools/hooks/prepare-commit-msg b/git-tools/hooks/prepare-commit-msg
index c3e5dfa90c..11d2b6b2f2 100755
--- a/git-tools/hooks/prepare-commit-msg
+++ b/git-tools/hooks/prepare-commit-msg
@@ -35,7 +35,7 @@ then
 	# Branch is prefixed with 'ticket/', append ticket ID to message
 	if [ "$branch" != "${branch##ticket/}" ];
 	then
-		tail="\n\nPHPBB3-${branch##ticket/}";
+		tail="$(printf "\n\nPHPBB3-${branch##ticket/}")";
 	fi
 
 	echo "[$branch] $tail$(cat "$1")" > "$1"