diff --git a/drivers/gpu/drm/nouveau/nv31_mpeg.c b/drivers/gpu/drm/nouveau/nv31_mpeg.c
index 6f06a07..5f239bf 100644
--- a/drivers/gpu/drm/nouveau/nv31_mpeg.c
+++ b/drivers/gpu/drm/nouveau/nv31_mpeg.c
@@ -24,6 +24,7 @@
 
 #include "drmP.h"
 #include "nouveau_drv.h"
+#include "nouveau_fifo.h"
 #include "nouveau_ramht.h"
 
 struct nv31_mpeg_engine {
@@ -208,6 +209,7 @@
 static int
 nv31_mpeg_isr_chid(struct drm_device *dev, u32 inst)
 {
+	struct nouveau_fifo_priv *pfifo = nv_engine(dev, NVOBJ_ENGINE_FIFO);
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_gpuobj *ctx;
 	unsigned long flags;
@@ -218,7 +220,7 @@
 		return 0;
 
 	spin_lock_irqsave(&dev_priv->channels.lock, flags);
-	for (i = 0; i < dev_priv->engine.fifo.channels; i++) {
+	for (i = 0; i < pfifo->channels; i++) {
 		if (!dev_priv->channels.ptr[i])
 			continue;