diff --git a/src/emu/bus/a2bus/a2diskiing.c b/src/emu/bus/a2bus/a2diskiing.c
index 0c2c1226ef3..7f63f940d9c 100644
--- a/src/emu/bus/a2bus/a2diskiing.c
+++ b/src/emu/bus/a2bus/a2diskiing.c
@@ -10,7 +10,6 @@
 #include "imagedev/floppy.h"
 #include "formats/ap2_dsk.h"
 #include "a2diskiing.h"
-#include <assert.h>
 
 /***************************************************************************
     PARAMETERS
diff --git a/src/emu/machine/wozfdc.c b/src/emu/machine/wozfdc.c
index c7e1c1f4323..b3c1659eb9f 100644
--- a/src/emu/machine/wozfdc.c
+++ b/src/emu/machine/wozfdc.c
@@ -10,7 +10,6 @@
 #include "imagedev/floppy.h"
 #include "formats/ap2_dsk.h"
 #include "wozfdc.h"
-#include <assert.h>
 
 /***************************************************************************
     PARAMETERS
diff --git a/src/mess/drivers/svision.c b/src/mess/drivers/svision.c
index e4cf17354d7..5c380a90e7f 100644
--- a/src/mess/drivers/svision.c
+++ b/src/mess/drivers/svision.c
@@ -4,7 +4,6 @@
  PeT mess@utanet.at in december 2000
 ******************************************************************************/
 
-#include <assert.h>
 #include "emu.h"
 #include "cpu/m6502/m65c02.h"
 
diff --git a/src/mess/machine/apple2gs.c b/src/mess/machine/apple2gs.c
index e728eb0b5d3..c5b717b939e 100644
--- a/src/mess/machine/apple2gs.c
+++ b/src/mess/machine/apple2gs.c
@@ -114,7 +114,6 @@
 
 *********************************************************************/
 
-#include <assert.h>
 #include "emu.h"
 
 #include "includes/apple2gs.h"
diff --git a/src/mess/machine/dgn_beta.c b/src/mess/machine/dgn_beta.c
index aaf8fae22d0..6854f8f6858 100644
--- a/src/mess/machine/dgn_beta.c
+++ b/src/mess/machine/dgn_beta.c
@@ -56,8 +56,6 @@
 ***************************************************************************/
 
 #include <math.h>
-#include <assert.h>
-
 #include "emu.h"
 #include "debug/debugcon.h"
 #include "cpu/m6809/m6809.h"