diff --git a/src/mess/drivers/mz2500.c b/src/mess/drivers/mz2500.c
index 5f94242d745..a7112dc8c78 100644
--- a/src/mess/drivers/mz2500.c
+++ b/src/mess/drivers/mz2500.c
@@ -90,7 +90,7 @@ public:
 	required_device<floppy_connector> m_floppy2;
 	required_device<floppy_connector> m_floppy3;
 
-	floppy_image_device *m_floppy = NULL;
+	floppy_image_device *m_floppy;
 
 	UINT8 *m_main_ram;
 	UINT8 *m_ipl_rom;