diff --git a/internal/hosted/hosted.go b/internal/hosted/hosted.go
index 5200e8a..045b908 100644
--- a/internal/hosted/hosted.go
+++ b/internal/hosted/hosted.go
@@ -780,8 +780,11 @@ func (r *Rooms) joinChat(ctx context.Context, n int64, inviteID string) *http.Re
 		}
 		// Refused as the client's own refusals are (it shows the explanation; booted ones as booted).
 		reason := int64(0)
-		if a.Reason == "banned" {
+		switch a.Reason {
+		case "banned":
 			reason = errorPublicRoomBooted
+		case "full":
+			reason = errorPublicRoomFull
 		}
 		return xmlrpcAnswer(xmlrpc.Struct{{Name: "response", Value: "declined"}, {Name: "reason", Value: reason}, {Name: "explanation", Value: msg}})
 	}
diff --git a/internal/hosted/hosted_test.go b/internal/hosted/hosted_test.go
index b0138cc..c946fb8 100644
--- a/internal/hosted/hosted_test.go
+++ b/internal/hosted/hosted_test.go
@@ -151,7 +151,7 @@ func TestHostedRoom(t *testing.T) {
 		t.Fatalf("events %v", *events)
 	}
 	// A full room: the client is told why.
-	if resp, _ := xmlrpcCall(t, r, "chat.imvu.com", "chat.getOrMakeChat", xmlrpc.Struct{{Name: "activity", Value: "publicroom-88-2100000009"}}); get(resp.Params[0], "response") != "declined" || get(resp.Params[0], "explanation") != "This room is full." {
+	if resp, _ := xmlrpcCall(t, r, "chat.imvu.com", "chat.getOrMakeChat", xmlrpc.Struct{{Name: "activity", Value: "publicroom-88-2100000009"}}); get(resp.Params[0], "response") != "declined" || get(resp.Params[0], "explanation") != "This room is full." || get(resp.Params[0], "reason") != int64(5) {
 		t.Fatalf("full room: %+v", resp)
 	}
 
diff --git a/internal/hosted/phase2.go b/internal/hosted/phase2.go
index 813cf08..f59492b 100644
--- a/internal/hosted/phase2.go
+++ b/internal/hosted/phase2.go
@@ -20,8 +20,11 @@ import (
 	"git.t5de.dev/t5de/t5de-proxy/internal/xmlrpc"
 )
 
-// errorPublicRoomBooted is the client's reason code for being refused a room it was booted from.
-const errorPublicRoomBooted = 4
+// The client's reason codes for refused joins: booted (it shows "booted"), and full (IMVU's own wording).
+const (
+	errorPublicRoomFull   = 5
+	errorPublicRoomBooted = 4
+)
 
 // invite is an invitation the client sent (outgoing, by the local ID the client knows) or got (incoming).
 type invite struct {