diff --git a/kernel/main.c b/kernel/main.c
index 98cb798..f59593f 100644
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -244,7 +244,7 @@ STATIC void setup_int_vectors(void)
   for (i = 0x23; i <= 0x3f; i++)
     setvec(i, empty_handler);
   for (pvec = vectors; pvec < vectors + (sizeof vectors/sizeof *pvec); pvec++)
-    setvec(pvec->intno, MK_FP(FP_SEG(empty_handler), pvec->handleroff));
+    setvec(pvec->intno, (intvec)MK_FP(FP_SEG(empty_handler), pvec->handleroff));
   pokeb(0, 0x30 * 4, 0xea);
   pokel(0, 0x30 * 4 + 1, (ULONG)cpm_entry);
 }