diff --git a/src/common/tv_filters/NTSCFilter.cxx b/src/common/tv_filters/NTSCFilter.cxx
index dfb9f2e7e..71d98b559 100644
--- a/src/common/tv_filters/NTSCFilter.cxx
+++ b/src/common/tv_filters/NTSCFilter.cxx
@@ -41,7 +41,7 @@ void NTSCFilter::setTIAPalette(const uInt32* palette)
   // The TIA palette consists of 128 colours, but the palette array actually
   // contains 256 entries, where only every second value is a valid colour
   uInt8* ptr = myTIAPalette;
-  for(int i = 0; i < 256; i+=2)
+  for(int i = 0; i < 256; i++)
   {
     *ptr++ = (palette[i] >> 16) & 0xff;
     *ptr++ = (palette[i] >> 8) & 0xff;
diff --git a/src/common/tv_filters/NTSCFilter.hxx b/src/common/tv_filters/NTSCFilter.hxx
index 19915d9b0..a187ae4b2 100644
--- a/src/common/tv_filters/NTSCFilter.hxx
+++ b/src/common/tv_filters/NTSCFilter.hxx
@@ -140,7 +140,7 @@ class NTSCFilter
     Preset myPreset;
 
     // 128 colours by 3 components per colour
-    uInt8 myTIAPalette[128 * 3];
+    uInt8 myTIAPalette[256 * 3];
 
     struct AdjustableTag {
       const char* type;
diff --git a/src/common/tv_filters/atari_ntsc.h b/src/common/tv_filters/atari_ntsc.h
index 4880aecea..5294de704 100644
--- a/src/common/tv_filters/atari_ntsc.h
+++ b/src/common/tv_filters/atari_ntsc.h
@@ -56,7 +56,7 @@ extern atari_ntsc_setup_t const atari_ntsc_svideo;    /* color bleeding only */
 extern atari_ntsc_setup_t const atari_ntsc_rgb;       /* crisp image */
 extern atari_ntsc_setup_t const atari_ntsc_bad;       /* badly adjusted TV */
 
-enum { atari_ntsc_palette_size = 128 };
+enum { atari_ntsc_palette_size = 256 };
 
 /* Initializes and adjusts parameters. Can be called multiple times on the same
    atari_ntsc_t object. Can pass NULL for either parameter. */
@@ -130,7 +130,7 @@ struct atari_ntsc_t {
 	atari_ntsc_rgb_t table [atari_ntsc_palette_size] [atari_ntsc_entry_size];
 };
 
-#define ATARI_NTSC_ENTRY_( ntsc, n ) (ntsc)->table [n >> 1 & 0x7F]
+#define ATARI_NTSC_ENTRY_( ntsc, n ) (ntsc)->table [n]
 
 /* common 3->7 ntsc macros */
 #define ATARI_NTSC_BEGIN_ROW_6_( pixel0, pixel1, ENTRY, table ) \