diff --git a/res/core/messages.xml b/res/core/messages.xml
index d40efb9ac..696cb9a2d 100644
--- a/res/core/messages.xml
+++ b/res/core/messages.xml
@@ -2690,6 +2690,62 @@
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diff --git a/src/kernel/messages.c b/src/kernel/messages.c
index 656e08b3a..98411973d 100644
--- a/src/kernel/messages.c
+++ b/src/kernel/messages.c
@@ -62,6 +62,7 @@ static message *missing_feedback(const char *name, const struct unit *u,
log_error("trying to create undefined feedback of type \"%s\"\n", name);
}
else if (missing_message_mode == MESSAGE_MISSING_REPLACE) {
+ log_warning("trying to create undefined message of type \"%s\"\n", name);
if (strcmp(name, "missing_feedback") != 0) {
if (!mt_find("missing_feedback")) {
mt_create_va(mt_new("missing_feedback", NULL), "unit:unit",