diff --git a/sound/firewire/fireface/ff-protocol-ff400.c b/sound/firewire/fireface/ff-protocol-ff400.c
index 8f34174ee813..fd257051d4a4 100644
--- a/sound/firewire/fireface/ff-protocol-ff400.c
+++ b/sound/firewire/fireface/ff-protocol-ff400.c
@@ -86,7 +86,7 @@ static int ff400_switch_fetching_mode(struct snd_ff *ff, bool enable)
 	if (reg == NULL)
 		return -ENOMEM;
 
-	if (enable) {
+	if (!enable) {
 		/*
 		 * Each quadlet is corresponding to data channels in a data
 		 * blocks in reverse order. Precisely, quadlets for available