diff --git a/plugins/system/sef/sef.php b/plugins/system/sef/sef.php
index 3fa5a85457ebb..c4f8c3c0109bb 100644
--- a/plugins/system/sef/sef.php
+++ b/plugins/system/sef/sef.php
@@ -40,20 +40,42 @@ public function onAfterDispatch()
 			return;
 		}
 
-		$uri     = JUri::getInstance();
-		$domain  = $this->params->get('domain');
+		$sefDomain = $this->params->get('domain', '');
 
-		if ($domain === false || $domain === '')
+		// Don't add a canonical html tag if no alternative domain has added in SEF plugin domain field.
+		if (empty($sefDomain))
 		{
-			$domain = $uri->toString(array('scheme', 'host', 'port'));
+			return;
 		}
 
-		$link = $domain . JRoute::_('index.php?' . http_build_query($this->app->getRouter()->getVars()), false);
+		// Check if a canonical html tag already exists (for instance, added by a component).
+		$canonical = '';
+		foreach ($doc->_links as $linkUrl => $link)
+		{
+			if (isset($link['relation']) && $link['relation'] === 'canonical')
+			{
+				$canonical = $linkUrl;
+				break;
+			}
+		}
 
-		if (rawurldecode($uri->toString()) !== $link)
+		// If a canonical html tag already exists get the canonical and change it to use the SEF plugin domain field.
+		if (!empty($canonical))
 		{
-			$doc->addHeadLink(htmlspecialchars($link), 'canonical');
+			// Remove current canonical link.
+			unset($doc->_links[$canonical]);
+
+			// Set the current canonical link but use the SEF system plugin domain field.
+			$canonical = $sefDomain . JUri::getInstance($canonical)->toString(array('path', 'query', 'fragment'));
+		}
+		// If a canonical html doesn't exists already add a canonical html tag using the SEF plugin domain field.
+		else
+		{
+			$canonical = $sefDomain . JUri::getInstance()->toString(array('path', 'query', 'fragment'));
 		}
+
+		// Add the canonical link.
+		$doc->addHeadLink(htmlspecialchars($canonical), 'canonical');
 	}
 
 	/**
diff --git a/plugins/system/sef/sef.xml b/plugins/system/sef/sef.xml
index c28b3b0afa04d..107f30dae7348 100644
--- a/plugins/system/sef/sef.xml
+++ b/plugins/system/sef/sef.xml
@@ -22,6 +22,7 @@
 				<field name="domain" type="url"
 					description="PLG_SEF_DOMAIN_DESCRIPTION"
 					label="PLG_SEF_DOMAIN_LABEL"
+					hint="https://www.example.com"
 					filter="url"
 					validate="url"
 				/>