diff --git a/src/mame/drivers/rd100.cpp b/src/mame/drivers/rd100.cpp
index 3bd2bc1f9e6..24988fdd62b 100644
--- a/src/mame/drivers/rd100.cpp
+++ b/src/mame/drivers/rd100.cpp
@@ -19,7 +19,7 @@
 
 #include "emu.h"
 #include "cpu/m6809/m6809.h"
-#include "machine/pia6821.h"
+#include "machine/6821pia.h"
 #include "screen.h"