diff --git a/sys/dev/sound/pci/emu10k1.c b/sys/dev/sound/pci/emu10k1.c
index edfdb1d3f4dd..db8cf7336013 100644
--- a/sys/dev/sound/pci/emu10k1.c
+++ b/sys/dev/sound/pci/emu10k1.c
@@ -1094,7 +1094,7 @@ emu_memalloc(struct sc_info *sc, u_int32_t sz, bus_addr_t *addr)
 	ofs = 0;
 	for (idx = start; idx < start + blksz; idx++) {
 		mem->bmap[idx >> 3] |= 1 << (idx & 7);
-		tmp = (u_int32_t)((u_int8_t *)&blk->buf_addr + ofs);
+		tmp = (u_int32_t)(u_long)((u_int8_t *)&blk->buf_addr + ofs);
 		/* printf("pte[%d] -> %x phys, %x virt\n", idx, tmp, ((u_int32_t)buf) + ofs); */
 		mem->ptb_pages[idx] = (tmp << 1) | idx;
 		ofs += EMUPAGESIZE;