diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 2a9052d0916..5094fad392a 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -4724,7 +4724,7 @@ function price2num($amount, $rounding = '', $option = 0)
 	if ($option != 1) {	// If not a PHP number or unknown, we change or clean format
 		//print 'PP'.$amount.' - '.$dec.' - '.$thousand.' - '.intval($amount).'<br>';
 		if (!is_numeric($amount)) {
-			$amount = preg_replace('/[a-zA-Z\/\\\*\(\)\<\>\-]/', '', $amount);
+			$amount = preg_replace('/[a-zA-Z\/\\\*\(\)\<\>]/', '', $amount);
 		}
 
 		if ($option == 2 && $thousand == '.' && preg_match('/\.(\d\d\d)$/', (string) $amount)) {	// It means the . is used as a thousand separator and string come frominput data, so 1.123 is 1123