diff --git a/src/devices/bus/isa/mcd.cpp b/src/devices/bus/isa/mcd.cpp
index 2a6b5422d72..d2cb19356e8 100644
--- a/src/devices/bus/isa/mcd.cpp
+++ b/src/devices/bus/isa/mcd.cpp
@@ -89,8 +89,8 @@ bool mcd_isa_device::read_sector(bool first)
 	if(m_mode & 0x40)
 	{
 		//correct the header
-		m_buf[12] = m_readmsf >> 16;
-		m_buf[13] = m_readmsf >> 8;
+		m_buf[12] = dec_2_bcd(m_readmsf >> 16);
+		m_buf[13] = dec_2_bcd(m_readmsf >> 8);
 	}
 	m_readmsf = lba_to_msf_alt(lba + 1);
 	m_buf_count = m_dmalen + 1;