diff --git a/htdocs/admin/security_captcha.php b/htdocs/admin/security_captcha.php
index e710915f8fc..c73631f5e74 100644
--- a/htdocs/admin/security_captcha.php
+++ b/htdocs/admin/security_captcha.php
@@ -91,11 +91,7 @@ print load_fiche_titre($langs->trans("SecuritySetup"), '', 'title_setup');
 print '<span class="opacitymedium">'.$langs->trans("CaptchaDesc")."</span><br>\n";
 print "<br>\n";
 
-$dirModCaptcha = array_merge(array('/core/modules/security/captcha'), is_array($conf->modules_parts['captcha']) ? $conf->modules_parts['captcha'] : array());
-foreach ($conf->modules_parts['captcha'] as $mo) {
-	//Add more models
-	$dirModCaptcha[] = $mo.'core/modules/security/captcha';
-}
+$dirModCaptcha = array_merge(array('/core/modules/security/captcha/'), is_array($conf->modules_parts['captcha']) ? $conf->modules_parts['captcha'] : array());
 
 // Load array with all captcha generation modules
 $arrayhandler = array();
diff --git a/htdocs/core/class/html.formticket.class.php b/htdocs/core/class/html.formticket.class.php
index de9d367f75b..6d65f8e119a 100644
--- a/htdocs/core/class/html.formticket.class.php
+++ b/htdocs/core/class/html.formticket.class.php
@@ -793,21 +793,36 @@ class FormTicket
 			require_once DOL_DOCUMENT_ROOT.'/core/lib/security2.lib.php';
 			$captcha = getDolGlobalString('MAIN_SECURITY_ENABLECAPTCHA_HANDLER', 'standard');
 
-			$classfile = DOL_DOCUMENT_ROOT."/core/modules/security/captcha/modCaptcha".ucfirst($captcha).'.class.php';
-			include_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
-			$captchaobj = null;
-			if (dol_is_file($classfile)) {
-				// Charging the numbering class
-				$classname = "modCaptcha".ucfirst($captcha);
-				require_once $classfile;
+			// List of directories where we can find captcha handlers
+			$dirModCaptcha = array_merge(array('main' => '/core/modules/security/captcha/'), is_array($conf->modules_parts['captcha']) ? $conf->modules_parts['captcha'] : array());
 
-				$captchaobj = new $classname($this->db, $conf, $langs, $user);
+			$fullpathclassfile = '';
+			foreach ($dirModCaptcha as $dir) {
+				$fullpathclassfile = dol_buildpath($dir."modCaptcha".ucfirst($captcha).'.class.php', 0, 2);
+				if ($fullpathclassfile) {
+					break;
+				}
 			}
 
-			if (is_object($captchaobj) && method_exists($captchaobj, 'getCaptchaCodeForForm')) {
-				print $captchaobj->getCaptchaCodeForForm();
+			if ($fullpathclassfile) {
+				include_once $fullpathclassfile;
+				$captchaobj = null;
+
+				// Charging the numbering class
+				$classname = "modCaptcha".ucfirst($captcha);
+				if (class_exists($classname)) {
+					$captchaobj = new $classname($this->db, $conf, $langs, $user);
+
+					if (is_object($captchaobj) && method_exists($captchaobj, 'getCaptchaCodeForForm')) {
+						print $captchaobj->getCaptchaCodeForForm();
+					} else {
+						print 'Error, the captcha handler '.get_class($captchaobj).' does not have any method getCaptchaCodeForForm()';
+					}
+				} else {
+					print 'Error, the captcha handler class '.$classname.' was not found after the include';
+				}
 			} else {
-				print 'Error, the captcha handler '.get_class($captchaobj).' does not have any method getCaptchaCodeForForm()';
+				print 'Error, the captcha handler '.$captcha.' has no class file found modCaptcha'.ucfirst($captcha);
 			}
 
 			print '<br></td></tr>';
diff --git a/htdocs/core/modules/security/captcha/modCaptchaStandard.class.php b/htdocs/core/modules/security/captcha/modCaptchaStandard.class.php
index cb736ff96d8..60cc6e5cdce 100644
--- a/htdocs/core/modules/security/captcha/modCaptchaStandard.class.php
+++ b/htdocs/core/modules/security/captcha/modCaptchaStandard.class.php
@@ -99,7 +99,7 @@ class modCaptchaStandard extends ModeleCaptcha
 	 * 	Return the HTML content to output on a form that need the captcha
 	 *
 	 *  @param		string	$php_self	An URL for the a href link
-	 *  @return     int					0 if KO, >0 if OK
+	 *  @return     string				The HTML code to output
 	 */
 	public function getCaptchaCodeForForm($php_self = '')
 	{
diff --git a/htdocs/core/tpl/login.tpl.php b/htdocs/core/tpl/login.tpl.php
index 6b9cefd6996..c33c89e2131 100644
--- a/htdocs/core/tpl/login.tpl.php
+++ b/htdocs/core/tpl/login.tpl.php
@@ -307,21 +307,35 @@ if (!empty($captcha)) {
 		$php_self .= '?time='.dol_print_date(dol_now(), 'dayhourlog');
 	}
 
-	$classfile = DOL_DOCUMENT_ROOT."/core/modules/security/captcha/modCaptcha".ucfirst($captcha).'.class.php';
-	include_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
-	$captchaobj = null;
-	if (dol_is_file($classfile)) {
-		// Charging the numbering class
-		$classname = "modCaptcha".ucfirst($captcha);
-		require_once $classfile;
-
-		$captchaobj = new $classname($db, $conf, $langs, $user);
+	// List of directories where we can find captcha handlers
+	$dirModCaptcha = array_merge(array('main' => '/core/modules/security/captcha/'), is_array($conf->modules_parts['captcha']) ? $conf->modules_parts['captcha'] : array());
+	$fullpathclassfile = '';
+	foreach ($dirModCaptcha as $dir) {
+		$fullpathclassfile = dol_buildpath($dir."modCaptcha".ucfirst($captcha).'.class.php', 0, 2);
+		if ($fullpathclassfile) {
+			break;
+		}
 	}
 
-	if (is_object($captchaobj) && method_exists($captchaobj, 'getCaptchaCodeForForm')) {
-		print $captchaobj->getCaptchaCodeForForm($php_self);
+	if ($fullpathclassfile) {
+		include_once $fullpathclassfile;
+		$captchaobj = null;
+
+		// Charging the numbering class
+		$classname = "modCaptcha".ucfirst($captcha);
+		if (class_exists($classname)) {
+			$captchaobj = new $classname($db, $conf, $langs, $user);
+
+			if (is_object($captchaobj) && method_exists($captchaobj, 'getCaptchaCodeForForm')) {
+				print $captchaobj->getCaptchaCodeForForm();
+			} else {
+				print 'Error, the captcha handler '.get_class($captchaobj).' does not have any method getCaptchaCodeForForm()';
+			}
+		} else {
+			print 'Error, the captcha handler class '.$classname.' was not found after the include';
+		}
 	} else {
-		print 'Error, the captcha handler '.get_class($captchaobj).' does not have any method getCaptchaCodeForForm()';
+		print 'Error, the captcha handler '.$captcha.' has no class file found modCaptcha'.ucfirst($captcha);
 	}
 }
 
diff --git a/htdocs/core/tpl/passwordforgotten.tpl.php b/htdocs/core/tpl/passwordforgotten.tpl.php
index aa5c12dcfe1..e2fb9115ac6 100644
--- a/htdocs/core/tpl/passwordforgotten.tpl.php
+++ b/htdocs/core/tpl/passwordforgotten.tpl.php
@@ -174,21 +174,35 @@ if (!empty($captcha)) {
 		$php_self .= '?time='.dol_print_date(dol_now(), 'dayhourlog');
 	}
 
-	$classfile = DOL_DOCUMENT_ROOT."/core/modules/security/captcha/modCaptcha".ucfirst($captcha).'.class.php';
-	include_once DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php';
-	$captchaobj = null;
-	if (dol_is_file($classfile)) {
-		// Charging the numbering class
-		$classname = "modCaptcha".ucfirst($captcha);
-		require_once $classfile;
-
-		$captchaobj = new $classname($db, $conf, $langs, $user);
+	// List of directories where we can find captcha handlers
+	$dirModCaptcha = array_merge(array('main' => '/core/modules/security/captcha/'), is_array($conf->modules_parts['captcha']) ? $conf->modules_parts['captcha'] : array());
+	$fullpathclassfile = '';
+	foreach ($dirModCaptcha as $dir) {
+		$fullpathclassfile = dol_buildpath($dir."modCaptcha".ucfirst($captcha).'.class.php', 0, 2);
+		if ($fullpathclassfile) {
+			break;
+		}
 	}
 
-	if (is_object($captchaobj) && method_exists($captchaobj, 'getCaptchaCodeForForm')) {
-		print $captchaobj->getCaptchaCodeForForm($php_self);
+	if ($fullpathclassfile) {
+		include_once $fullpathclassfile;
+		$captchaobj = null;
+
+		// Charging the numbering class
+		$classname = "modCaptcha".ucfirst($captcha);
+		if (class_exists($classname)) {
+			$captchaobj = new $classname($db, $conf, $langs, $user);
+
+			if (is_object($captchaobj) && method_exists($captchaobj, 'getCaptchaCodeForForm')) {
+				print $captchaobj->getCaptchaCodeForForm();
+			} else {
+				print 'Error, the captcha handler '.get_class($captchaobj).' does not have any method getCaptchaCodeForForm()';
+			}
+		} else {
+			print 'Error, the captcha handler class '.$classname.' was not found after the include';
+		}
 	} else {
-		print 'Error, the captcha handler '.get_class($captchaobj).' does not have any method getCaptchaCodeForForm()';
+		print 'Error, the captcha handler '.$captcha.' has no class file found modCaptcha'.ucfirst($captcha);
 	}
 }