diff --git a/ext/gd/libgd/gd.c b/ext/gd/libgd/gd.c
index 2664288162a7..7265758696ad 100644
--- a/ext/gd/libgd/gd.c
+++ b/ext/gd/libgd/gd.c
@@ -960,7 +960,9 @@ static int gdImageTileGet (gdImagePtr im, int x, int y)
 	srcy = y % gdImageSY(im->tile);
 	p = gdImageGetPixel(im->tile, srcx, srcy);
 
-	if (im->trueColor) {
+	if (p == im->tile->transparent) {
+		tileColor = im->transparent;
+	} else if (im->trueColor) {
 		if (im->tile->trueColor) {
 			tileColor = p;
 		} else {
diff --git a/ext/gd/tests/gh17349.phpt b/ext/gd/tests/gh17349.phpt
new file mode 100644
index 000000000000..cd0fc4317b59
--- /dev/null
+++ b/ext/gd/tests/gh17349.phpt
@@ -0,0 +1,27 @@
+--TEST--
+GH-17349 (Tiled truecolor filling looses single color transparency)
+--EXTENSIONS--
+gd
+--FILE--
+<?php
+require_once __DIR__ . "/func.inc";
+
+$tile = imagecreatetruecolor(8, 8);
+$red = imagecolorallocate($tile, 255, 0, 0);
+imagefilledrectangle($tile, 0, 0, 7, 7, $red);
+imagecolortransparent($tile, $red);
+
+$im = imagecreatetruecolor(64, 64);
+$bg = imagecolorallocate($im, 255, 255, 255);
+imagefilledrectangle($im, 0, 0, 63, 63, $bg);
+imagecolortransparent($im, $bg);
+$fg = imagecolorallocate($im, 0, 0, 0);
+imageellipse($im, 31, 31, 50, 50, $fg);
+imagesettile($im, $tile);
+imagealphablending($im, false);
+imagefill($im, 31, 31, IMG_COLOR_TILED);
+
+test_image_equals_file(__DIR__ . "/gh17349.png", $im);
+?>
+--EXPECT--
+The images are equal.
diff --git a/ext/gd/tests/gh17349.png b/ext/gd/tests/gh17349.png
new file mode 100644
index 000000000000..dd75d9df9904
Binary files /dev/null and b/ext/gd/tests/gh17349.png differ