diff --git a/src/mame/audio/snes_snd.c b/src/mame/audio/snes_snd.c
index 8df8804ec38..588ded60b4c 100644
--- a/src/mame/audio/snes_snd.c
+++ b/src/mame/audio/snes_snd.c
@@ -231,7 +231,7 @@ void snes_sound_device::device_reset()
 
 void snes_sound_device::dsp_reset()
 {
-#ifdef DEBUG
+#ifdef MAME_DEBUG
 	logerror("dsp_reset\n");
 #endif
 
@@ -706,7 +706,7 @@ void snes_sound_device::dsp_update( short *sound_ptr )
 		if (m_dsp_regs[0x6c] & 0x40)
 		{
 			/* MUTE */
-#ifdef DEBUG
+#ifdef MAME_DEBUG
 			logerror("MUTED!\n");
 #endif
 
diff --git a/src/mame/machine/archimds.c b/src/mame/machine/archimds.c
index 539b1f85d72..399df278613 100644
--- a/src/mame/machine/archimds.c
+++ b/src/mame/machine/archimds.c
@@ -809,7 +809,7 @@ WRITE32_MEMBER(archimedes_state::archimedes_vidc_w)
 {
 	UINT32 reg = data>>24;
 	UINT32 val = data & 0xffffff;
-	//#ifdef DEBUG
+	//#ifdef MAME_DEBUG
 	static const char *const vrnames[] =
 	{
 		"horizontal total",
@@ -896,7 +896,7 @@ WRITE32_MEMBER(archimedes_state::archimedes_vidc_w)
 		}
 
 
-		//#ifdef DEBUG
+		//#ifdef MAME_DEBUG
 		logerror("VIDC: %s = %d\n", vrnames[(reg-0x80)/4], m_vidc_regs[reg]);
 		//#endif
 
diff --git a/src/mame/machine/fddebug.c b/src/mame/machine/fddebug.c
index 51515a72b89..9abaec03ef2 100644
--- a/src/mame/machine/fddebug.c
+++ b/src/mame/machine/fddebug.c
@@ -2195,7 +2195,7 @@ static void build_optable(running_machine &machine)
 									length += ((flags & OF_SIZEMASK) == OF_LONG) ? 2 : 1;
 
 								/* make sure we match the disassembler */
-								#ifdef DEBUG
+								#ifdef MAME_DEBUG
 								{
 									char dummybuffer[40];
 									UINT8 instrbuffer[10];
diff --git a/src/mess/machine/wswan.c b/src/mess/machine/wswan.c
index 5643547c85d..1295dc7e6e6 100644
--- a/src/mess/machine/wswan.c
+++ b/src/mess/machine/wswan.c
@@ -799,7 +799,7 @@ WRITE8_MEMBER( wswan_state::wswan_port_w )
 					src++;
 					dst++;
 				}
-#ifdef DEBUG
+#ifdef MAME_DEBUG
 					logerror( "DMA  src:%X dst:%X length:%d\n", src, dst, length );
 #endif
 				m_ws_portram[0x40] = src & 0xFF;