diff --git a/src/mame/drivers/socrates.cpp b/src/mame/drivers/socrates.cpp
index 96894ef401a..6780f5a2b94 100644
--- a/src/mame/drivers/socrates.cpp
+++ b/src/mame/drivers/socrates.cpp
@@ -81,6 +81,7 @@ TODO:
 ******************************************************************************/
 
 /* Core includes */
+#include "emu.h"
 #include "audio/socrates.h"
 #include "cpu/z80/z80.h"