diff --git a/inc/Service/Media/GdThumbGenerator.php b/inc/Service/Media/GdThumbGenerator.php
index 1c5f446a..7132b867 100644
--- a/inc/Service/Media/GdThumbGenerator.php
+++ b/inc/Service/Media/GdThumbGenerator.php
@@ -2,11 +2,11 @@
 namespace Vichan\Service\Media;
 
 use Vichan\Data\ThumbGenerationResult;
+use Vichan\Functions\Fs;
 
-use function Vichan\Functions\Fs\link_or_copy;
 
 class GdThumbGenerator implements ThumbGenerator {
-	private const PHP81 = PHP_MAJOR_VERSION >= 8 && PHP_MINOR_VERSION >= 1;
+	private const PHP81 = \PHP_MAJOR_VERSION >= 8 && \PHP_MINOR_VERSION >= 1;
 
 	private const MIME_TO_EXT = [
 		'image/jpeg' => 'jpg',
@@ -21,17 +21,17 @@ class GdThumbGenerator implements ThumbGenerator {
 	private static function imageCreateFrom(string $file, string $mime): mixed {
 		switch ($mime) {
 			case 'image/jpeg':
-				return imagecreatefromjpeg($file);
+				return \imagecreatefromjpeg($file);
 			case 'image/png':
-				return imagecreatefrompng($file);
+				return \imagecreatefrompng($file);
 			case 'image/gif':
-				return imagecreatefromgif($file);
+				return \imagecreatefromgif($file);
 			case 'image/webp':
-				return imagecreatefromwbmp($file);
+				return \imagecreatefromwbmp($file);
 			case 'image/bmp':
-				return imagecreatefrombmp($file);
+				return \imagecreatefrombmp($file);
 			case 'image/avif':
-				return self::PHP81 ? imagecreatefromavif($file) : false;
+				return self::PHP81 ? \imagecreatefromavif($file) : false;
 		}
 		return false;
 	}
@@ -40,17 +40,17 @@ class GdThumbGenerator implements ThumbGenerator {
 		// Somebody should tune the quality and speed values...
 		switch ($mime) {
 			case 'image/jpeg':
-				return imagejpeg($gd, $file, 50);
+				return \imagejpeg($gd, $file, 50);
 			case 'image/png':
-				return imagepng($gd, $file, 7);
+				return \imagepng($gd, $file, 7);
 			case 'image/gif':
-				return imagegif($gd, $file);
+				return \imagegif($gd, $file);
 			case 'image/webp':
-				return imagewbmp($gd, $file, 50);
+				return \imagewbmp($gd, $file, 50);
 			case 'image/bmp':
-				return imagebmp($gd, $file, true);
+				return \imagebmp($gd, $file, true);
 			case 'image/avif':
-				return self::PHP81 ? imageavif($gd, $file, 30, 6) : false;
+				return self::PHP81 ? \imageavif($gd, $file, 30, 6) : false;
 		}
 		return false;
 	}
@@ -59,9 +59,9 @@ class GdThumbGenerator implements ThumbGenerator {
 		$gd = \imagecreatetruecolor($width, $height);
 		switch ($mime) {
 			case 'image/png':
-				imagecolortransparent($gd, imagecolorallocatealpha($gd, 0, 0, 0, 0));
-				imagesavealpha($gd, true);
-				imagealphablending($gd, false);
+				\imagecolortransparent($gd, \imagecolorallocatealpha($gd, 0, 0, 0, 0));
+				\imagesavealpha($gd, true);
+				\imagealphablending($gd, false);
 				break;
 			case 'image/gif':
 				\imagecolortransparent($gd, \imagecolorallocatealpha($gd, 0, 0, 0, 0));
@@ -100,7 +100,7 @@ class GdThumbGenerator implements ThumbGenerator {
 		if ($width <= $max_width && $height <= $max_height) {
 			$out_path = $preferred_out_file_path . '.' . self::MIME_TO_EXT[$source_file_mime];
 
-			if (!link_or_copy($source_file_path, $out_path)) {
+			if (!Fs\link_or_copy($source_file_path, $out_path)) {
 				throw new \RuntimeException("Could not link or copy '$source_file_path' to '$out_path'");
 			}