diff --git a/sys/dev/drm/drm_pci.c b/sys/dev/drm/drm_pci.c
index 6d46c5d1ea4..afd66047f21 100644
--- a/sys/dev/drm/drm_pci.c
+++ b/sys/dev/drm/drm_pci.c
@@ -91,7 +91,7 @@ drm_pci_alloc(struct drm_device *dev, size_t size,
 	}
 
 	ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
-	    BUS_DMA_WAITOK | BUS_DMA_ZERO, &dmah->map);
+	    BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
 	if (ret != 0) {
 		bus_dma_tag_destroy(dmah->tag);
 		free(dmah, DRM_MEM_DMA);