diff --git a/htdocs/comm/propal/class/propal.class.php b/htdocs/comm/propal/class/propal.class.php
index 6daca0f1c99..699ade8172a 100644
--- a/htdocs/comm/propal/class/propal.class.php
+++ b/htdocs/comm/propal/class/propal.class.php
@@ -1415,7 +1415,9 @@ class Propal extends CommonObject
 			}
 
 			// reset ref_client
-			$object->ref_client = '';
+			if (!getDolGlobalString('MAIN_KEEP_REF_CUSTOMER_ON_CLONING')) {
+				$object->ref_client = '';
+			}
 
 			// TODO Change product price if multi-prices
 		} else {