diff --git a/htdocs/core/class/translate.class.php b/htdocs/core/class/translate.class.php
index a1747296e22..e6c8ea33502 100644
--- a/htdocs/core/class/translate.class.php
+++ b/htdocs/core/class/translate.class.php
@@ -682,7 +682,7 @@ class Translate
 				}
 			}
 
-			$str = preg_replace('/([^%])%([^0sd])/', '__percent_parenthesis__', $str);
+			$str = preg_replace('/([^%])%([^%0sdmYIMpHSBb])/', '\1__percent_with_bad_specifier__\2', $str);
 
 			if (strpos($key, 'Format') !== 0) {
 				try {
@@ -693,7 +693,7 @@ class Translate
 				}
 			}
 
-			$str = str_replace('__percent_parenthesis__', '%)', $str);
+			$str = str_replace('__percent_with_bad_specifier__', '%', $str);
 
 			// We replace some HTML tags by __xx__ to avoid having them encoded by htmlentities because
 			// we want to keep '"' '<b>' '</b>' '<u>' '</u>' '<i>' '</i>' '<center> '</center>' '<strong' '</strong>' '<a ' '</a>' '<br>' '<span' '</span>' '< ' that are reliable HTML tags inside translation strings.
diff --git a/test/phpunit/LangTest.php b/test/phpunit/LangTest.php
index 5b7a22b247e..1cb8c53c532 100644
--- a/test/phpunit/LangTest.php
+++ b/test/phpunit/LangTest.php
@@ -26,7 +26,7 @@
  *		\remarks	To run this script as CLI:  phpunit filename.php
  */
 
-global $conf,$user,$langs,$db;
+global $conf, $user, $langs, $db;
 //define('TEST_DB_FORCE_TYPE','mysql');	// This is to force using mysql driver
 //require_once 'PHPUnit/Autoload.php';
 require_once dirname(__FILE__).'/../../htdocs/master.inc.php';
@@ -104,7 +104,7 @@ class LangTest extends CommonClassTest
 	}
 
 	/**
-	 * testLang
+	 * testTransWithHTMLInParam
 	 *
 	 * @return 	void
 	 */
@@ -138,6 +138,44 @@ class LangTest extends CommonClassTest
 		return;
 	}
 
+	/**
+	 * testTransWithPercent
+	 *
+	 * @return 	void
+	 */
+	public function testTransWithPercent(): void
+	{
+		global $conf,$user,$langs,$db;
+		$conf = $this->savconf;
+		$user = $this->savuser;
+		$langs = $this->savlangs;
+		$db = $this->savdb;
+
+		include_once DOL_DOCUMENT_ROOT.'/core/class/translate.class.php';
+
+		$newlang = new Translate('', $conf);
+		$newlang->setDefaultLang('fr_FR');
+		$newlang->load("main");
+
+		$result = $newlang->trans("DatabaseConnection");
+		print "result=".$result.PHP_EOL;
+		$this->assertEquals('Connexion &agrave; la base', $result);
+
+		$result = $newlang->transnoentities("FormatDateHourSecShort");
+		print "result=".$result.PHP_EOL;
+		$this->assertEquals('%d/%m/%Y %H:%M:%S', $result);
+
+		$newlang = new Translate('', $conf);
+		$newlang->setDefaultLang('en_US');
+		$newlang->load("main");
+
+		$result = $newlang->transnoentities("FormatDateHourText");
+		print "result=".$result.PHP_EOL;
+		$this->assertEquals('%B %d, %Y, %I:%M %p', $result);
+
+		return;
+	}
+
 	/**
 	 * testLang
 	 * @dataProvider langDataProvider