diff --git a/cpu.h b/CPU.h
similarity index 100%
rename from cpu.h
rename to CPU.h
diff --git a/hardware.cpp b/hardware.cpp
index 59eab72..0def11d 100644
--- a/hardware.cpp
+++ b/hardware.cpp
@@ -7,7 +7,7 @@
 #include "memory.h"
 #include "spiram.h"
 
-#include "cpu.h"
+#include "CPU.h"
 #include "hardware.h"
 
 Memory memory;
diff --git a/i8080.cpp b/i8080.cpp
index 22c8b30..1477228 100644
--- a/i8080.cpp
+++ b/i8080.cpp
@@ -1,7 +1,7 @@
 #include <Energia.h>
 
 #include "memory.h"
-#include "cpu.h"
+#include "CPU.h"
 #include "ports.h"
 #include "i8080.h"
 
diff --git a/r6502.cpp b/r6502.cpp
index e2aae93..0a76952 100644
--- a/r6502.cpp
+++ b/r6502.cpp
@@ -2,7 +2,7 @@
 #include <Stream.h>
 
 #include "memory.h"
-#include "cpu.h"
+#include "CPU.h"
 #include "r6502.h"
 
 #define CPU_STATE_FMT "%02x %02x %02x %02x %d%d%d%d%d%d%d%d	%04x\r",\
diff --git a/r65emu.h b/r65emu.h
index e1337f9..7f53c3c 100644
--- a/r65emu.h
+++ b/r65emu.h
@@ -2,7 +2,7 @@
 #define __R65EMU_H__
 
 #include "memory.h"
-#include "cpu.h"
+#include "CPU.h"
 #include "ram.h"
 #include "spiram.h"
 #include "prom.h"
diff --git a/z80.cpp b/z80.cpp
index 588db98..6027c7e 100644
--- a/z80.cpp
+++ b/z80.cpp
@@ -2,7 +2,7 @@
 
 #include "memory.h"
 #include "ports.h"
-#include "cpu.h"
+#include "CPU.h"
 #include "z80.h"
 
 #define CPU_STATE_FMT "%04x %02x %02x %04x %04x %04x %04x %d%d%d%d%d%d%d%d\r\n",\