diff --git a/stand/i386/libi386/biosdisk.c b/stand/i386/libi386/biosdisk.c
index 1e819033b4e3..a6a8c98d64aa 100644
--- a/stand/i386/libi386/biosdisk.c
+++ b/stand/i386/libi386/biosdisk.c
@@ -275,7 +275,7 @@ bd_int13probe(struct bdinfo *bd)
 
 		total = (uint64_t)params.cylinders *
 		    params.heads * params.sectors_per_track;
-		if (bd->bd_sectors > total)
+		if (total > 0 && bd->bd_sectors > total)
 			bd->bd_sectors = total;
 
 		ret = 1;