diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index d8a8bb8cb74..de8c4519a22 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -2496,12 +2496,12 @@ class Form
 				$soc = new Societe($db);
 				$result = $soc->fetch($socid);
 				if ($result > 0 && !empty($soc->default_lang)) {
-					$sql .= " AND pl.lang='" . $this->db->escape($soc->default_lang) . "'";
+					$sql .= " AND pl.lang = '".$this->db->escape($soc->default_lang)."'";
 				} else {
-					$sql .= " AND pl.lang='".$this->db->escape($langs->getDefaultLang())."'";
+					$sql .= " AND pl.lang = '".$this->db->escape($langs->getDefaultLang())."'";
 				}
 			} else {
-				$sql .= " AND pl.lang='".$this->db->escape($langs->getDefaultLang())."'";
+				$sql .= " AND pl.lang = '".$this->db->escape($langs->getDefaultLang())."'";
 			}
 		}
 
diff --git a/htdocs/mrp/mo_movements.php b/htdocs/mrp/mo_movements.php
index 8ee47ea0bf9..f0fe25eddb6 100644
--- a/htdocs/mrp/mo_movements.php
+++ b/htdocs/mrp/mo_movements.php
@@ -812,8 +812,8 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 			// TODO Use a cache here
 			$sql = "SELECT label";
 			$sql .= " FROM ".MAIN_DB_PREFIX."product_lang";
-			$sql .= " WHERE fk_product=".$objp->rowid;
-			$sql .= " AND lang='".$db->escape($langs->getDefaultLang())."'";
+			$sql .= " WHERE fk_product = ".((int) $objp->rowid);
+			$sql .= " AND lang = '".$db->escape($langs->getDefaultLang())."'";
 			$sql .= " LIMIT 1";
 
 			$result = $db->query($sql);
diff --git a/htdocs/product/index.php b/htdocs/product/index.php
index e4c81f9fd8c..e4a0bfc7421 100644
--- a/htdocs/product/index.php
+++ b/htdocs/product/index.php
@@ -342,8 +342,8 @@ if ((!empty($conf->product->enabled) || !empty($conf->service->enabled)) && ($us
 				if (!empty($conf->global->MAIN_MULTILANGS)) {
 					$sql = "SELECT label";
 					$sql .= " FROM ".MAIN_DB_PREFIX."product_lang";
-					$sql .= " WHERE fk_product=".((int) $objp->rowid);
-					$sql .= " AND lang='".$db->escape($langs->getDefaultLang())."'";
+					$sql .= " WHERE fk_product = ".((int) $objp->rowid);
+					$sql .= " AND lang = '".$db->escape($langs->getDefaultLang())."'";
 
 					$resultd = $db->query($sql);
 					if ($resultd) {
diff --git a/htdocs/product/popuprop.php b/htdocs/product/popuprop.php
index dbffe79d0c0..9028e81a757 100644
--- a/htdocs/product/popuprop.php
+++ b/htdocs/product/popuprop.php
@@ -212,7 +212,7 @@ if ($mode && $mode != '-1') {
 			$sql = "SELECT label";
 			$sql .= " FROM ".MAIN_DB_PREFIX."product_lang";
 			$sql .= " WHERE fk_product = ".((int) $prodid);
-			$sql .= " AND lang='".$db->escape($langs->getDefaultLang())."'";
+			$sql .= " AND lang = '".$db->escape($langs->getDefaultLang())."'";
 			$sql .= " LIMIT 1";
 
 			$resultp = $db->query($sql);
diff --git a/htdocs/product/stock/movement_list.php b/htdocs/product/stock/movement_list.php
index 1c5bc703ca7..ed5896ca6cc 100644
--- a/htdocs/product/stock/movement_list.php
+++ b/htdocs/product/stock/movement_list.php
@@ -1160,8 +1160,8 @@ while ($i < min($num, $limit)) {
 		// TODO Use a cache
 		$sql = "SELECT label";
 		$sql .= " FROM ".MAIN_DB_PREFIX."product_lang";
-		$sql .= " WHERE fk_product=".$objp->rowid;
-		$sql .= " AND lang='".$db->escape($langs->getDefaultLang())."'";
+		$sql .= " WHERE fk_product = ".((int) $objp->rowid);
+		$sql .= " AND lang = '".$db->escape($langs->getDefaultLang())."'";
 		$sql .= " LIMIT 1";
 
 		$result = $db->query($sql);