diff --git a/src/devices/bus/isa/bblue2.cpp b/src/devices/bus/isa/bblue2.cpp
index 26a14e2b9b3..afefb9de7f4 100644
--- a/src/devices/bus/isa/bblue2.cpp
+++ b/src/devices/bus/isa/bblue2.cpp
@@ -12,6 +12,7 @@
  *   Parallel port test fails if set to LPT2
  */
 
+#include "emu.h"
 #include "bblue2.h"