diff --git wp-admin/includes/post-formats.php wp-admin/includes/post-formats.php
index be0d458..5f952ca 100644
--- wp-admin/includes/post-formats.php
+++ wp-admin/includes/post-formats.php
@@ -36,8 +36,8 @@ $format_meta = get_post_format_meta( $post_ID );
 				?>
 			</a>
 		</div>
-		<label for="_wp_format_image" class="screen-reader-text"><?php _e( 'Image URL' ); ?>:</label>
-		<input id="wp_format_image" type="hidden" name="_wp_format_image" value="<?php echo esc_url( $format_meta['image'] ); ?>" placeholder="<?php esc_attr_e( 'Image URL' ); ?>" class="widefat" />
+		<label for="_wp_format_image" class="screen-reader-text"><?php _e( 'Attachment ID' ); ?>:</label>
+		<input id="wp_format_image" type="hidden" name="_wp_format_image" value="<?php if ( $image ) esc_attr_e( $format_meta['image'] ); ?>" placeholder="<?php esc_attr_e( 'Attachment ID' ); ?>" class="widefat" />
 	</div>
 
 	<div class="field wp-format-link wp-format-quote wp-format-image">