diff --git a/data/event-schemas/schema/m.room.message$m.location.yaml b/data/event-schemas/schema/m.room.message$m.location.yaml
index bfe986d2..3f1b9c1c 100644
--- a/data/event-schemas/schema/m.room.message$m.location.yaml
+++ b/data/event-schemas/schema/m.room.message$m.location.yaml
@@ -14,6 +14,7 @@ properties:
         description: A [geo URI (RFC5870)](https://datatracker.ietf.org/doc/html/rfc5870) representing this location.
         type: string
         format: uri
+        pattern: "^geo:"
       msgtype:
         enum:
           - m.location