diff --git a/kernel/initdisk.c b/kernel/initdisk.c
index 673d927..49ee27c 100644
--- a/kernel/initdisk.c
+++ b/kernel/initdisk.c
@@ -1262,6 +1262,8 @@ void ReadAllPartitionTables(void)
 
   /* quick adjustment of diskette parameter table */
   fmemcpy(int1e_table, *(char FAR * FAR *)MK_FP(0, 0x1e*4), sizeof(int1e_table));
+  /* currently only 512 bytes per sector floppies are supported, log2(512/128)=2 */
+  int1e_table[3] = 2;
   /* enforce min. 9 sectors per track */
   if (int1e_table[4] < 9)
     int1e_table[4] = 9;