diff --git a/src/Http/FileUpload.php b/src/Http/FileUpload.php
index eeae28cf..bd748d5e 100644
--- a/src/Http/FileUpload.php
+++ b/src/Http/FileUpload.php
@@ -246,7 +246,7 @@ public function toImage(): Image
 
 	/**
 	 * Returns the [width, height] dimensions of the uploaded image, or null if it is not a valid image.
-	 * @return ?array{int, int}
+	 * @return ?array{int<0, max>, int<0, max>}
 	 */
 	public function getImageSize(): ?array
 	{
diff --git a/tests/types/http-types.php b/tests/types/http-types.php
index dedc179f..01bf05c6 100644
--- a/tests/types/http-types.php
+++ b/tests/types/http-types.php
@@ -29,5 +29,5 @@ function testSessionSectionArrayAccess(SessionSection $section): void
 function testFileUploadGetImageSize(FileUpload $upload): void
 {
 	$size = $upload->getImageSize();
-	assertType('array{int, int}|null', $size);
+	assertType('array{int<0, max>, int<0, max>}|null', $size);
 }