diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index 0141c131f68..0c65f752519 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -873,9 +873,11 @@ static int bus_append_execute_property(sd_bus_message *m, const char *field, con
                 } else if ((n = startswith(eq, "file:"))) {
                         appended = strjoina(field, "File");
                         r = sd_bus_message_append(m, "(sv)", appended, "s", n);
+                } else if ((n = startswith(eq, "append:"))) {
+                        appended = strjoina(field, "FileToAppend");
+                        r = sd_bus_message_append(m, "(sv)", appended, "s", n);
                 } else
                         r = sd_bus_message_append(m, "(sv)", field, "s", eq);
-
                 if (r < 0)
                         return bus_log_create_error(r);