diff --git a/NEWS b/NEWS
index 21d1a949..136160b5 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,4 @@
+  - enabled hex-constants in function.math.php (messju)
   - enabled hex-constants (0x...) as function-attributes, inside if-statements
     and as modifier-parameters (messju)
   - fixed bug with passing $smarty as reference in Smarty.compiler.class
diff --git a/libs/plugins/function.math.php b/libs/plugins/function.math.php
index 3230dec9..482363f6 100644
--- a/libs/plugins/function.math.php
+++ b/libs/plugins/function.math.php
@@ -25,11 +25,10 @@ function smarty_function_math($params, &$smarty)
     }
 
     // match all vars in equation, make sure all are passed
-    preg_match_all("![a-zA-Z][a-zA-Z0-9_]*!",$equation, $match);
+    preg_match_all("!\!(0x)([a-zA-Z][a-zA-Z0-9_]*)!",$equation, $match);
     $allowed_funcs = array('int','abs','ceil','cos','exp','floor','log','log10',
                            'max','min','pi','pow','rand','round','sin','sqrt','srand','tan');
-
-    foreach($match[0] as $curr_var) {
+    foreach($match[2] as $curr_var) {
         if (!in_array($curr_var,array_keys($params)) && !in_array($curr_var, $allowed_funcs)) {
             $smarty->trigger_error("math: parameter $curr_var not passed as argument");
             return;