diff --git a/include/ircd/m/event/conforms.h b/include/ircd/m/event/conforms.h
index dca1b15d8..c86223cec 100644
--- a/include/ircd/m/event/conforms.h
+++ b/include/ircd/m/event/conforms.h
@@ -72,6 +72,7 @@ enum ircd::m::event::conforms::code
 	MISMATCH_ORIGIN_SENDER,            ///< sender mxid host not from origin
 	MISMATCH_ORIGIN_EVENT_ID,          ///< event_id mxid host not from origin
 	MISMATCH_CREATE_SENDER,            ///< m.room.create room_id host != sender host
+	MISMATCH_ALIASES_STATE_KEY,        ///< m.room.aliases has no state_key
 	SELF_REDACTS,                      ///< event redacts itself
 	SELF_PREV_EVENT,                   ///< event_id self-referenced in prev_events
 	SELF_PREV_STATE,                   ///< event_id self-referenced in prev_state
diff --git a/ircd/m_event.cc b/ircd/m_event.cc
index 84d31e61b..c880ef426 100644
--- a/ircd/m_event.cc
+++ b/ircd/m_event.cc
@@ -176,6 +176,7 @@ ircd::m::event_conforms_reflects
 	"MISMATCH_ORIGIN_SENDER",
 	"MISMATCH_ORIGIN_EVENT_ID",
 	"MISMATCH_CREATE_SENDER",
+	"MISMATCH_ALIASES_STATE_KEY",
 	"SELF_REDACTS",
 	"SELF_PREV_EVENT",
 	"SELF_PREV_STATE",
@@ -268,6 +269,10 @@ ircd::m::event::conforms::conforms(const event &e)
 		if(m::room::id(json::get<"room_id"_>(e)).host() != m::user::id(json::get<"sender"_>(e)).host())
 			set(MISMATCH_CREATE_SENDER);
 
+	if(json::get<"type"_>(e) == "m.room.aliases")
+		if(m::user::id(json::get<"sender"_>(e)).host() != json::get<"state_key"_>(e))
+			set(MISMATCH_ALIASES_STATE_KEY);
+
 	if(json::get<"type"_>(e) == "m.room.redaction")
 		if(!valid(m::id::EVENT, json::get<"redacts"_>(e)))
 			set(INVALID_OR_MISSING_REDACTS_ID);