diff --git a/roomserver/internal/helpers/sanity.go b/roomserver/internal/helpers/sanity.go
deleted file mode 100644
index 32fe47204..000000000
--- a/roomserver/internal/helpers/sanity.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package helpers
-
-import (
-	"encoding/json"
-	"fmt"
-
-	"github.com/matrix-org/gomatrixserverlib"
-)
-
-// SanityCheckEvent looks for any obvious problems with the event before
-// we bother to continue processing it any further.
-func SanityCheckEvent(event *gomatrixserverlib.Event) error {
-	switch event.Type() {
-	case gomatrixserverlib.MRoomCreate:
-		var content gomatrixserverlib.CreateContent
-		if err := json.Unmarshal(event.Content(), &content); err != nil {
-			return fmt.Errorf("Failed to unmarshal content of create event %q", event.EventID())
-		}
-
-		// Check that the room version is supported.
-		if content.RoomVersion != nil {
-			if _, err := content.RoomVersion.EventFormat(); err != nil {
-				return fmt.Errorf("Room version %q is unsupported in create event %q", *content.RoomVersion, event.EventID())
-			}
-		}
-	}
-	return nil
-}
diff --git a/roomserver/internal/input/input_events.go b/roomserver/internal/input/input_events.go
index 394bb58ad..f953a9259 100644
--- a/roomserver/internal/input/input_events.go
+++ b/roomserver/internal/input/input_events.go
@@ -44,17 +44,6 @@ func (r *Inputer) processRoomEvent(
 	headered := input.Event
 	event := headered.Unwrap()
 
-	// Run sanity checks against the event. This will catch any really
-	// obvious problems.
-	if err = helpers.SanityCheckEvent(&event); err != nil {
-		logrus.WithFields(logrus.Fields{
-			"event_id": event.EventID(),
-			"type":     event.Type(),
-			"room":     event.RoomID(),
-		}).WithError(err).Info("Event failed sanity-checks")
-		return
-	}
-
 	// Check that the event passes authentication checks and work out
 	// the numeric IDs for the auth events.
 	isRejected := false