diff --git a/src/devices/machine/z80dma.cpp b/src/devices/machine/z80dma.cpp
index 1a347cc2f24..68396ed7177 100644
--- a/src/devices/machine/z80dma.cpp
+++ b/src/devices/machine/z80dma.cpp
@@ -334,7 +334,12 @@ int z80dma_device::is_ready()
 void z80dma_device::interrupt_check()
 {
 	m_out_int_cb(m_ip ? ASSERT_LINE : CLEAR_LINE);
-	m_out_ieo_cb(m_iei && !m_ip);
+	
+	int ieo = m_iei;
+	if (m_ip) {
+		ieo = 0;
+	}
+	m_out_ieo_cb(ieo);
 }
 
 
diff --git a/src/devices/machine/z80dma.h b/src/devices/machine/z80dma.h
index 14725329bd0..74edbfa8d70 100644
--- a/src/devices/machine/z80dma.h
+++ b/src/devices/machine/z80dma.h
@@ -128,7 +128,7 @@ private:
 	uint8_t m_latch;
 
 	// interrupts
-	bool m_iei;
+	int m_iei;					// interrupt enable input
 	int m_ip;                   // interrupt pending
 	int m_ius;                  // interrupt under service
 	uint8_t m_vector;             // interrupt vector