diff --git a/htdocs/core/lib/xcal.lib.php b/htdocs/core/lib/xcal.lib.php
index 5101f70959a..f8db5833635 100644
--- a/htdocs/core/lib/xcal.lib.php
+++ b/htdocs/core/lib/xcal.lib.php
@@ -397,6 +397,18 @@ function build_rssfile($format, $title, $desc, $events_array, $outputfile, $filt
 					$tmpevent['desc'] = $event->description;
 					if (!empty($event->image)) {
 						$tmpevent['image'] = $GLOBALS['website']->virtualhost.'/medias/'.$event->image;
+					} else {
+						include_once DOL_DOCUMENT_ROOT.'/core/lib/website.lib.php';
+						$tmpimage = getImageFromHtmlContent($event->content);
+						if ($tmpimage) {
+							if (strpos($tmpimage, '/') === 0) {				// If $tmpimage is an absolute path
+								$tmpevent['image'] = $GLOBALS['website']->virtualhost.$tmpimage;
+							} elseif (stripos($tmpimage, 'http:') === 0) {	// If $tmpimage is a full URI
+								$tmpevent['image'] = $tmpimage;
+							} else {
+								$tmpevent['image'] = $GLOBALS['website']->virtualhost.'/medias/'.$tmpimage;
+							} // TODO If $tmpimage is "data:..."
+						}
 					}
 					$tmpevent['content'] = $event->content;