diff --git a/src/mame/drivers/altos5.cpp b/src/mame/drivers/altos5.cpp
index b7d498e264c..4fa1f75f2d0 100644
--- a/src/mame/drivers/altos5.cpp
+++ b/src/mame/drivers/altos5.cpp
@@ -50,7 +50,7 @@ public:
 	DECLARE_WRITE_LINE_MEMBER(ctc_z1_w);
 	DECLARE_WRITE_LINE_MEMBER(busreq_w);
 	DECLARE_WRITE_LINE_MEMBER(fdc_intrq_w);
-	WRITE_LINE_MEMBER(clock_w);
+	DECLARE_WRITE_LINE_MEMBER(clock_w);
 
 private:
 	UINT8 m_port08;
@@ -243,7 +243,7 @@ WRITE_LINE_MEMBER( altos5_state::busreq_w )
 }
 
 // baud rate generator and RTC. All inputs are 2MHz.
-DECLARE_WRITE_LINE_MEMBER( altos5_state::clock_w )
+WRITE_LINE_MEMBER( altos5_state::clock_w )
 {
 	m_ctc->trg0(state);
 	m_ctc->trg1(state);
diff --git a/src/mame/drivers/ampro.cpp b/src/mame/drivers/ampro.cpp
index f7f7b25f037..858bfff9115 100644
--- a/src/mame/drivers/ampro.cpp
+++ b/src/mame/drivers/ampro.cpp
@@ -49,7 +49,7 @@ public:
 	DECLARE_WRITE8_MEMBER(port00_w);
 	DECLARE_READ8_MEMBER(io_r);
 	DECLARE_WRITE8_MEMBER(io_w);
-	WRITE_LINE_MEMBER(clock_w);
+	DECLARE_WRITE_LINE_MEMBER(clock_w);
 
 private:
 	required_device<cpu_device> m_maincpu;
@@ -121,7 +121,7 @@ static const z80_daisy_config daisy_chain_intf[] =
 };
 
 // Baud rate generator. All inputs are 2MHz.
-DECLARE_WRITE_LINE_MEMBER( ampro_state::clock_w )
+WRITE_LINE_MEMBER( ampro_state::clock_w )
 {
 	m_ctc->trg0(state);
 	m_ctc->trg1(state);
diff --git a/src/mame/drivers/dmax8000.cpp b/src/mame/drivers/dmax8000.cpp
index ccac1b46b78..797200876db 100644
--- a/src/mame/drivers/dmax8000.cpp
+++ b/src/mame/drivers/dmax8000.cpp
@@ -57,8 +57,8 @@ public:
 	DECLARE_WRITE8_MEMBER(port14_w);
 	DECLARE_WRITE8_MEMBER(port40_w);
 	DECLARE_WRITE_LINE_MEMBER(ctc_z0_w);
-	WRITE_LINE_MEMBER(fdc_drq_w);
-	WRITE_LINE_MEMBER(clock_w);
+	DECLARE_WRITE_LINE_MEMBER(fdc_drq_w);
+	DECLARE_WRITE_LINE_MEMBER(clock_w);
 
 private:
 	required_device<cpu_device> m_maincpu;
@@ -148,7 +148,7 @@ DRIVER_INIT_MEMBER( dmax8000_state, dmax8000 )
 }
 
 // Baud rate generator. All inputs are 2MHz.
-DECLARE_WRITE_LINE_MEMBER( dmax8000_state::clock_w )
+WRITE_LINE_MEMBER( dmax8000_state::clock_w )
 {
 	m_ctc->trg0(state);
 	m_ctc->trg1(state);
diff --git a/src/mame/drivers/konin.cpp b/src/mame/drivers/konin.cpp
index f3a3377d86d..db194aa5e59 100644
--- a/src/mame/drivers/konin.cpp
+++ b/src/mame/drivers/konin.cpp
@@ -57,7 +57,7 @@ public:
 		, m_uart(*this, "uart")
 	{ }
 
-	WRITE_LINE_MEMBER(clock_w);
+	DECLARE_WRITE_LINE_MEMBER(clock_w);
 
 private:
 	virtual void machine_reset() override;
@@ -96,7 +96,7 @@ void konin_state::machine_reset()
 {
 }
 
-DECLARE_WRITE_LINE_MEMBER( konin_state::clock_w )
+WRITE_LINE_MEMBER( konin_state::clock_w )
 {
 	m_uart->write_txc(state);
 	m_uart->write_rxc(state);
diff --git a/src/mame/drivers/tim100.cpp b/src/mame/drivers/tim100.cpp
index 02d7de0fa61..26900fef369 100644
--- a/src/mame/drivers/tim100.cpp
+++ b/src/mame/drivers/tim100.cpp
@@ -36,9 +36,9 @@ public:
 		, m_uart18(*this, "uart_u18")
 		{ }
 
-	WRITE_LINE_MEMBER(drq_w);
-	WRITE_LINE_MEMBER(irq_w);
-	WRITE_LINE_MEMBER(clock_w);
+	DECLARE_WRITE_LINE_MEMBER(drq_w);
+	DECLARE_WRITE_LINE_MEMBER(irq_w);
+	DECLARE_WRITE_LINE_MEMBER(clock_w);
 	I8275_DRAW_CHARACTER_MEMBER( crtc_display_pixels );
 
 private:
@@ -158,7 +158,7 @@ WRITE_LINE_MEMBER( tim100_state::irq_w )
 		m_maincpu->set_input_line(I8085_RST65_LINE, CLEAR_LINE);
 }
 
-DECLARE_WRITE_LINE_MEMBER( tim100_state::clock_w )
+WRITE_LINE_MEMBER( tim100_state::clock_w )
 {
 	m_uart17->write_txc(state);
 	m_uart17->write_rxc(state);