diff --git a/tests/phpunit/tests/functions.php b/tests/phpunit/tests/functions.php
index 2c458d968c531..3294d15480034 100644
--- a/tests/phpunit/tests/functions.php
+++ b/tests/phpunit/tests/functions.php
@@ -1284,7 +1284,11 @@ public function test_wp_get_image_mime( $file, $expected ) {
 			$this->markTestSkipped( 'The exif PHP extension is not loaded.' );
 		}
 
-		$this->assertSame( $expected, wp_get_image_mime( $file ) );
+		if ( is_array( $expected ) ) {
+			$this->assertContains( wp_get_image_mime( $file ), $expected );
+		} else {
+			$this->assertSame( $expected, wp_get_image_mime( $file ) );
+		}
 	}
 
 	/**
@@ -1360,7 +1364,8 @@ public function data_wp_get_image_mime() {
 			// HEIC.
 			array(
 				DIR_TESTDATA . '/images/test-image.heic',
-				'image/heic',
+				// In PHP 8.5, it returns 'image/heif'. Before that, it returns 'image/heic'.
+				array( 'image/heic', 'image/heif' ),
 			),
 		);