diff --git a/usb/config_test.go b/usb/config_test.go
index 288eee7..7035e8a 100644
--- a/usb/config_test.go
+++ b/usb/config_test.go
@@ -27,6 +27,16 @@ func TestEndpointInfo(t *testing.T) {
 			},
 			want: "Endpoint #2 OUT (address 0x02) isochronous - asynchronous data [512 bytes]",
 		},
+		{
+			ep: EndpointInfo{
+				Number:        3,
+				Direction:     EndpointDirectionIn,
+				TransferType:  TransferTypeInterrupt,
+				MaxPacketSize: 16,
+				UsageType:     InterruptUsageTypePeriodic,
+			},
+			want: "Endpoint #3 IN (address 0x83) interrupt - periodic [16 bytes]",
+		},
 	} {
 		if got := tc.ep.String(); got != tc.want {
 			t.Errorf("%#v.String(): got %q, want %q", tc.ep, got, tc.want)