diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index 9571fb5b04..9282444228 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -1495,7 +1495,7 @@ SWFUpload.onload = function() {
 	<div>
 	<?php _e( 'Choose files to upload' ); ?>
 	<div id="flash-browse-button"></div>
-	<span><input id="cancel-upload" disabled="disabled" onClick="cancelUpload()" type="button" value="<?php esc_attr_e('Cancel Upload'); ?>" class="button" /></span>
+	<span><input id="cancel-upload" disabled="disabled" onclick="cancelUpload()" type="button" value="<?php esc_attr_e('Cancel Upload'); ?>" class="button" /></span>
 	</div>
 	<p class="media-upload-size"><?php printf( __( 'Maximum upload file size: %d%s' ), $upload_size_unit, $sizes[$u] ); ?></p>
 <?php do_action('post-flash-upload-ui'); ?>