diff --git a/drivers/gpu/drm/nouveau/nv04_mc.c b/drivers/gpu/drm/nouveau/nv04_mc.c
index 617ed1e052692cc6f80746560e0b2d494c58d776..2af43a1cb2ec00e698dbbd320e1bdffeaee3dab3 100644
--- a/drivers/gpu/drm/nouveau/nv04_mc.c
+++ b/drivers/gpu/drm/nouveau/nv04_mc.c
@@ -11,6 +11,10 @@ nv04_mc_init(struct drm_device *dev)
 	 */
 
 	nv_wr32(dev, NV03_PMC_ENABLE, 0xFFFFFFFF);
+
+	/* Disable PROM access. */
+	nv_wr32(dev, NV_PBUS_PCI_NV_20, NV_PBUS_PCI_NV_20_ROM_SHADOW_ENABLED);
+
 	return 0;
 }