diff --git a/sys/amd64/amd64/busdma_machdep.c b/sys/amd64/amd64/busdma_machdep.c
index 7b183b7f2fac..d8c6a9dd30af 100644
--- a/sys/amd64/amd64/busdma_machdep.c
+++ b/sys/amd64/amd64/busdma_machdep.c
@@ -589,8 +589,6 @@ _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
 	return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
 }
 
-#define BUS_DMAMAP_NSEGS ((64 * 1024) / PAGE_SIZE + 1)
-
 /*
  * Map the buffer buf into bus space using the dmamap map.
  */