diff --git a/src/common/tv_filters/NTSCFilter.hxx b/src/common/tv_filters/NTSCFilter.hxx
index b23e8f1fe..4ea3950a1 100644
--- a/src/common/tv_filters/NTSCFilter.hxx
+++ b/src/common/tv_filters/NTSCFilter.hxx
@@ -24,7 +24,7 @@ class TIASurface;
 class Settings;
 
 #include "bspf.hxx"
-#include "atari_ntsc.h"
+#include "atari_ntsc.hxx"
 
 #define SCALE_FROM_100(x) ((x/50.0)-1.0)
 #define SCALE_TO_100(x) (uInt32)(50*(x+1.0))
diff --git a/src/common/tv_filters/atari_ntsc.c b/src/common/tv_filters/atari_ntsc.cxx
similarity index 99%
rename from src/common/tv_filters/atari_ntsc.c
rename to src/common/tv_filters/atari_ntsc.cxx
index 7662f6108..7ae1f517f 100644
--- a/src/common/tv_filters/atari_ntsc.c
+++ b/src/common/tv_filters/atari_ntsc.cxx
@@ -17,7 +17,7 @@
 // $Id$
 //============================================================================
 
-#include "atari_ntsc.h"
+#include "atari_ntsc.hxx"
 
 /* Copyright (C) 2006-2009 Shay Green. This module is free software; you
    can redistribute it and/or modify it under the terms of the GNU Lesser
@@ -48,7 +48,7 @@ atari_ntsc_setup_t const atari_ntsc_bad       = {  0.1, -0.3, 0.3, 0.25, 0.2, 0.
 
 #define gamma_size 256
 
-#include "atari_ntsc_impl.h"
+#include "atari_ntsc_impl.hxx"
 
 /* 2 input pixels -> 8 composite samples */
 pixel_info_t const atari_ntsc_pixels [alignment_count] = {
diff --git a/src/common/tv_filters/atari_ntsc.h b/src/common/tv_filters/atari_ntsc.hxx
similarity index 100%
rename from src/common/tv_filters/atari_ntsc.h
rename to src/common/tv_filters/atari_ntsc.hxx
diff --git a/src/common/tv_filters/atari_ntsc_impl.h b/src/common/tv_filters/atari_ntsc_impl.hxx
similarity index 100%
rename from src/common/tv_filters/atari_ntsc_impl.h
rename to src/common/tv_filters/atari_ntsc_impl.hxx