diff --git a/src/emu/emu.h b/src/emu/emu.h
index 6d55125f07b..e7ed73a7d6b 100644
--- a/src/emu/emu.h
+++ b/src/emu/emu.h
@@ -56,10 +56,6 @@
 #include "romload.h"
 #include "save.h"
 
-// define machine_config_constructor here due to circular dependency
-// between devices and the machine config
-typedef void (*machine_config_constructor)(machine_config &config, device_t *owner, device_t *device);
-
 // I/O
 #include "input.h"
 #include "ioport.h"