diff --git a/tests/phpunit/includes/factory/class-wp-unittest-factory-for-attachment.php b/tests/phpunit/includes/factory/class-wp-unittest-factory-for-attachment.php
index 262c6c4640790..989275879df1c 100644
--- a/tests/phpunit/includes/factory/class-wp-unittest-factory-for-attachment.php
+++ b/tests/phpunit/includes/factory/class-wp-unittest-factory-for-attachment.php
@@ -61,8 +61,17 @@ public function create_object( $args, $legacy_parent = 0, $legacy_args = array()
 	 * @return int|WP_Error The attachment ID on success, WP_Error object on failure.
 	 */
 	public function create_upload_object( $file, $parent_post_id = 0 ) {
-		$contents = file_get_contents( $file );
-		$upload   = wp_upload_bits( wp_basename( $file ), null, $contents );
+		$contents      = file_get_contents( $file );
+		$upload_dir    = wp_upload_dir();
+		$file_basename = wp_basename( $file );
+		$file_path     = $upload_dir['path'] . '/' . $file_basename;
+
+		// Remove existing file if it exists.
+		if ( file_exists( $file_path ) ) {
+			unlink( $file_path );
+		}
+
+		$upload = wp_upload_bits( $file_basename, null, $contents );
 
 		$type = '';
 		if ( ! empty( $upload['type'] ) ) {