Trouble with rendering antialiased string on surface

Hi guys,
I'm having a problem with drawing a text on image surface, here is example code

#include <cairo.h>
int main(int argc, char **argv)
{
	cairo_surface_t* tar_surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32,210,200);

	cairo_t* ctx = cairo_create(tar_surface);

	cairo_move_to(ctx,10,50);

	cairo_font_options_t* cfo = cairo_font_options_create();
	cairo_font_options_set_antialias(cfo,CAIRO_ANTIALIAS_SUBPIXEL);
	cairo_set_font_options(ctx,cfo);

	cairo_select_font_face(ctx,"Sans",CAIRO_FONT_SLANT_NORMAL,CAIRO_FONT_WEIGHT_BOLD);
	cairo_set_font_size(ctx,40);
	cairo_set_source_rgba(ctx,1,1,1,1);
	cairo_show_text(ctx,"RAAWR");

	cairo_move_to(ctx,10,150);
	cairo_set_source_rgb(ctx,0,0,0);
	cairo_show_text(ctx,"RAAWR");

	cairo_surface_write_to_png(tar_surface,"pic.png");

	return 0;
}


and pic genereated by it http://s8.postimage.org/9e67ndveb/pic.png
(it's printed on transparent bg)
Problem is that white string have some strange antialiasing color
(yellow), but black one is ok - any tips?
It's possible im doing something terribly wrong.

Marcin.
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