diff --git a/sys/x86/x86/busdma_bounce.c b/sys/x86/x86/busdma_bounce.c
--- a/sys/x86/x86/busdma_bounce.c
+++ b/sys/x86/x86/busdma_bounce.c
@@ -325,6 +325,7 @@
 		if ((dmat->bounce_flags & BUS_DMA_MIN_ALLOC_COMP) == 0 ||
 		    (bz->map_count > 0 && bz->total_bpages < maxpages)) {
 			pages = MAX(atop(dmat->common.maxsize), 1);
+			pages = MIN(dmat->common.nsegments, pages);
 			pages = MIN(maxpages - bz->total_bpages, pages);
 			pages = MAX(pages, 1);
 			if (alloc_bounce_pages(dmat, pages) < pages)