diff --git a/htdocs/comm/propal/class/propal.class.php b/htdocs/comm/propal/class/propal.class.php
index 7e34ac6fc3c..525a267dacc 100644
--- a/htdocs/comm/propal/class/propal.class.php
+++ b/htdocs/comm/propal/class/propal.class.php
@@ -3153,7 +3153,7 @@ class Propal extends CommonObject
 		$sql .= " c.datec, c.date_valid as datev, c.date_cloture as dateo,";
 		$sql .= " c.fk_user_author, c.fk_user_valid, c.fk_user_cloture";
 		$sql .= " FROM ".MAIN_DB_PREFIX."propal as c";
-		$sql .= " WHERE c.rowid = ".$id;
+		$sql .= " WHERE c.rowid = ".((int) $id);
 
 		$result = $this->db->query($sql);
 
diff --git a/htdocs/compta/paiement/cheque/class/remisecheque.class.php b/htdocs/compta/paiement/cheque/class/remisecheque.class.php
index 00815c90f7d..cc882b5f1ee 100644
--- a/htdocs/compta/paiement/cheque/class/remisecheque.class.php
+++ b/htdocs/compta/paiement/cheque/class/remisecheque.class.php
@@ -98,7 +98,7 @@ class RemiseCheque extends CommonObject
 		$sql .= " FROM ".MAIN_DB_PREFIX."bordereau_cheque as bc";
 		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."bank_account as ba ON bc.fk_bank_account = ba.rowid";
 		$sql .= " WHERE bc.entity = ".$conf->entity;
-		if ($id)  $sql .= " AND bc.rowid = ".$id;
+		if ($id)  $sql .= " AND bc.rowid = ".((int) $id);
 		if ($ref) $sql .= " AND bc.ref = '".$this->db->escape($ref)."'";
 
 		dol_syslog("RemiseCheque::fetch", LOG_DEBUG);
diff --git a/htdocs/contact/class/contact.class.php b/htdocs/contact/class/contact.class.php
index 8ea6ebea0d4..91a32f39f26 100644
--- a/htdocs/contact/class/contact.class.php
+++ b/htdocs/contact/class/contact.class.php
@@ -879,7 +879,7 @@ class Contact extends CommonObject
 		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."user as u ON c.rowid = u.fk_socpeople";
 		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."societe as s ON c.fk_soc = s.rowid";
 		$sql.= ' LEFT JOIN '.MAIN_DB_PREFIX.'c_stcommcontact as st ON c.fk_stcommcontact = st.id';
-		if ($id) $sql .= " WHERE c.rowid = ".$id;
+		if ($id) $sql .= " WHERE c.rowid = ".((int) $id);
 		else {
 			$sql .= " WHERE c.entity IN (".getEntity($this->element).")";
 			if ($ref_ext) {
diff --git a/htdocs/contrat/class/contrat.class.php b/htdocs/contrat/class/contrat.class.php
index e179bd50797..0b62146b080 100644
--- a/htdocs/contrat/class/contrat.class.php
+++ b/htdocs/contrat/class/contrat.class.php
@@ -2028,7 +2028,7 @@ class Contrat extends CommonObject
 		$sql .= " c.tms as date_modification,";
 		$sql .= " fk_user_author";
 		$sql .= " FROM ".MAIN_DB_PREFIX."contrat as c";
-		$sql .= " WHERE c.rowid = ".$id;
+		$sql .= " WHERE c.rowid = ".((int) $id);
 
 		$result = $this->db->query($sql);
 		if ($result)
diff --git a/htdocs/core/class/comment.class.php b/htdocs/core/class/comment.class.php
index a083576aacb..39ae2eb63ef 100644
--- a/htdocs/core/class/comment.class.php
+++ b/htdocs/core/class/comment.class.php
@@ -186,7 +186,7 @@ class Comment extends CommonObject
 		$sql .= " c.entity,";
 		$sql .= " c.import_key";
 		$sql .= " FROM ".MAIN_DB_PREFIX.$this->table_element." as c";
-		$sql .= " WHERE c.rowid = ".$id;
+		$sql .= " WHERE c.rowid = ".((int) $id);
 
 		dol_syslog(get_class($this)."::fetch", LOG_DEBUG);
 		$resql = $this->db->query($sql);
diff --git a/htdocs/supplier_proposal/class/supplier_proposal.class.php b/htdocs/supplier_proposal/class/supplier_proposal.class.php
index 92759515ba4..8a198720e56 100644
--- a/htdocs/supplier_proposal/class/supplier_proposal.class.php
+++ b/htdocs/supplier_proposal/class/supplier_proposal.class.php
@@ -2103,7 +2103,7 @@ class SupplierProposal extends CommonObject
 		$sql .= " c.datec, c.date_valid as datev, c.date_cloture as dateo,";
 		$sql .= " c.fk_user_author, c.fk_user_valid, c.fk_user_cloture";
 		$sql .= " FROM ".MAIN_DB_PREFIX."supplier_proposal as c";
-		$sql .= " WHERE c.rowid = ".$id;
+		$sql .= " WHERE c.rowid = ".((int) $id);
 
 		$result = $this->db->query($sql);