diff --git a/src/emu/machine/tmp68301.c b/src/emu/machine/tmp68301.c
index c5a4b8f4fe3..4a85b36dce3 100644
--- a/src/emu/machine/tmp68301.c
+++ b/src/emu/machine/tmp68301.c
@@ -90,7 +90,7 @@ READ16_MEMBER(tmp68301_device::pdr_r)
 
 WRITE16_MEMBER(tmp68301_device::pdr_w)
 {
-	m_out_parallel_cb(0, data & m_pdir, 0xffff);
+	m_out_parallel_cb(0, data & m_pdir, mem_mask);
 }