diff --git a/server/proxy/channels/pf_channel_smartcard.c b/server/proxy/channels/pf_channel_smartcard.c
index e0b758850..cc2ba33f7 100644
--- a/server/proxy/channels/pf_channel_smartcard.c
+++ b/server/proxy/channels/pf_channel_smartcard.c
@@ -81,9 +81,9 @@ static BOOL pf_channel_client_write_iostatus(wStream* out, const SMARTCARD_OPERA
 	WINPR_ASSERT(out);
 
 	pos = Stream_GetPosition(out);
+	Stream_SetPosition(out, 0);
 	if (!Stream_CheckAndLogRequiredLength(TAG, out, 16))
 		return FALSE;
-	Stream_SetPosition(out, 0);
 
 	Stream_Read_UINT16(out, component);
 	Stream_Read_UINT16(out, packetid);