diff --git a/src/devices/bus/hp_dio/hp98544.cpp b/src/devices/bus/hp_dio/hp98544.cpp
index 976ecd0f6b3..e2b4df56350 100644
--- a/src/devices/bus/hp_dio/hp98544.cpp
+++ b/src/devices/bus/hp_dio/hp98544.cpp
@@ -8,6 +8,7 @@
 
 ***************************************************************************/
 
+#include "emu.h"
 #include "hp98544.h"
 #include "screen.h"