diff --git a/libgambatte/include/gambatte.h b/libgambatte/include/gambatte.h
index 3e4d0da..eb3abf2 100644
--- a/libgambatte/include/gambatte.h
+++ b/libgambatte/include/gambatte.h
@@ -107,6 +107,8 @@ private:
 	GB(const GB &);
 	GB & operator=(const GB &);
 };
+
+video_pixel_t gbcToRgb32(const unsigned bgr15);
 }
 
 #endif
diff --git a/libgambatte/libretro/gbcpalettes.h b/libgambatte/libretro/gbcpalettes.h
index b423fec..6808c53 100644
--- a/libgambatte/libretro/gbcpalettes.h
+++ b/libgambatte/libretro/gbcpalettes.h
@@ -495,12 +495,4 @@ static const unsigned short * findGbcPal(const char *const title) {
 	return findGbcTitlePal(title);
 }
 
-static unsigned long gbcToRgb32(const unsigned rgb15) {
-	const unsigned long r = rgb15 >> 10 & 0x1F;
-	const unsigned long g = rgb15 >>  5 & 0x1F;
-	const unsigned long b = rgb15       & 0x1F;
-	
-	return ((r * 13 + g * 2 + b) >> 1) << 16 | (g * 3 + b) << 9 | (r * 3 + g * 2 + b * 11) >> 1;
-}
-
 }
diff --git a/libgambatte/libretro/libretro.cpp b/libgambatte/libretro/libretro.cpp
index 79b07cf..7416461 100644
--- a/libgambatte/libretro/libretro.cpp
+++ b/libgambatte/libretro/libretro.cpp
@@ -1,8 +1,7 @@
 #include "libretro.h"
 #include "blipper.h"
-#include "gbcpalettes.h"
-
 #include <gambatte.h>
+#include "gbcpalettes.h"
 
 #include <assert.h>
 #include <stdio.h>
@@ -256,6 +255,11 @@ static void check_palette(void)
          fprintf(stderr, "[Gambatte]: unable to read palette color in %s, line %d (color left as default).\n", custom_palette_path.c_str(), line_count);
          continue;
       }
+#ifdef VIDEO_RGB565
+      rgb32=(rgb32&0x0000F8)>>3 |//red
+            (rgb32&0x00FC00)>>5 |//green
+            (rgb32&0xF80000)>>8;//blue
+#endif
 
       if (startswith(line, "Background0="))
          gb.setDmgPaletteColor(0, 0, rgb32);
@@ -328,7 +332,7 @@ static void check_variables(void)
    {
       for (unsigned colornum = 0; colornum < 4; ++colornum)
       {
-         rgb32 = gbcToRgb32(gbc_bios_palette[palnum * 4 + colornum]);
+         rgb32 = gambatte::gbcToRgb32(gbc_bios_palette[palnum * 4 + colornum]);
          gb.setDmgPaletteColor(palnum, colornum, rgb32);
       }
    }
diff --git a/libgambatte/src/video.cpp b/libgambatte/src/video.cpp
index d07cd93..b33d2df 100644
--- a/libgambatte/src/video.cpp
+++ b/libgambatte/src/video.cpp
@@ -30,7 +30,7 @@ void LCD::setDmgPalette(video_pixel_t *const palette, const video_pixel_t *const
 	palette[3] = dmgColors[data >> 6 & 3];
 }
 
-static video_pixel_t gbcToRgb32(const unsigned bgr15) {
+video_pixel_t gbcToRgb32(const unsigned bgr15) {
 #ifdef VIDEO_RGB565
 	//If (whatever made the Gambatte devs create this somewhat arcane configuration) is not a concern, it can be replaced with simply 'return bgr15'.
 	const unsigned r = bgr15 & 0x1F;