diff --git a/src/rc/git-tools.kak b/src/rc/git-tools.kak
index 3cc005a4..d2031e6c 100644
--- a/src/rc/git-tools.kak
+++ b/src/rc/git-tools.kak
@@ -51,7 +51,7 @@ def -shell-params git %{ %sh{
                 for (( i=1; $i < $count; i++ )); do
                     flag="$flag:$(($line+$i))|black|$text"
                 done
-                echo "set buffer -add buffer=$kak_bufname git_blame_flags %{${flag}}" | socat -u stdin UNIX-CONNECT:/tmp/kak-${kak_session}
+                echo "set -add buffer=$kak_bufname git_blame_flags %{${flag}}" | socat -u stdin UNIX-CONNECT:/tmp/kak-${kak_session}
             }
             git blame --incremental $kak_bufname | ( while read blame_line; do
                 if [[ $blame_line =~ ([0-9a-f]{40}).([0-9]+).([0-9]+).([0-9]+) ]]; then