diff --git a/src/emu/imagedev/chd_cd.c b/src/emu/imagedev/chd_cd.c
index a286112aef9..6e8eb867680 100644
--- a/src/emu/imagedev/chd_cd.c
+++ b/src/emu/imagedev/chd_cd.c
@@ -58,12 +58,14 @@ void cdrom_image_device::device_config_complete()
     	memset(&m_interface, 0, sizeof(m_interface));
 		memset(&m_device_displayinfo, 0, sizeof(m_device_displayinfo));
 	}
+	
+	m_extension_list = "chd,cue,toc,nrg,gdi,iso,cdr";
 
 	image_device_format *format = global_alloc_clear(image_device_format);;
 	format->m_index 	  = 0;
 	format->m_name        = "chdcd";
 	format->m_description = "CD-ROM drive";
-	format->m_extensions  = "chd,cue,toc,nrg,gdi,iso,cdr";
+	format->m_extensions  = m_extension_list;
 	format->m_optspec     = cd_option_spec;
 	format->m_next		  = NULL;
 
diff --git a/src/emu/imagedev/chd_cd.h b/src/emu/imagedev/chd_cd.h
index 5c9af0ebf6b..a5e7ca5cfa3 100644
--- a/src/emu/imagedev/chd_cd.h
+++ b/src/emu/imagedev/chd_cd.h
@@ -47,7 +47,7 @@ public:
 	virtual bool must_be_loaded() const { return 0; }
 	virtual bool is_reset_on_load() const { return 0; }
 	virtual const char *image_interface() const { return m_interface; }
-	virtual const char *file_extensions() const { return "chd"; }
+	virtual const char *file_extensions() const { return m_extension_list; }
 	virtual const option_guide *create_option_guide() const;
 
 	// specific implementation
@@ -61,6 +61,7 @@ protected:
 	chd_file	m_self_chd;
 	cdrom_file	*m_cdrom_handle;
 	image_device_format m_format;
+	const char	*m_extension_list;
 };
 
 // device type definition