diff --git a/bastion/resource_device_service.go b/bastion/resource_device_service.go
index adb12bf..21589bc 100644
--- a/bastion/resource_device_service.go
+++ b/bastion/resource_device_service.go
@@ -317,7 +317,7 @@ func rdpSubProtocolsValid() []string {
 		"RDP_DRIVE",
 		"RDP_SMARTCARD",
 		"RDP_AUDIO_OUTPUT",
-		"RDP_AUDIO_OUTPUT",
+		"RDP_AUDIO_INPUT",
 	}
 }