diff --git a/html/js/scripts.js b/html/js/scripts.js
index c3133e7e0..280942930 100644
--- a/html/js/scripts.js
+++ b/html/js/scripts.js
@@ -254,7 +254,8 @@ function set_value(p_ctl, p_value, p_add)
 function compute_number(value)
 {
     var retval = 0;
-    var exp = new RegExp("^[0-9/*+-.]+$", "g");
+    
+    var exp = new RegExp("^[0-9/*+-.()]+$", "g");
     /*pour éviter un eval() mal intentionné*/
     var res = exp.test(value);
     if (res)
@@ -3667,4 +3668,4 @@ function toggle_row_warning_enable(p_enable, p_row)
     } else {
         $(p_row).hide();
     }
-}
\ No newline at end of file
+}