diff --git a/benchmark.php b/benchmark.php
index 6bd8be3..dcbd08e 100644
--- a/benchmark.php
+++ b/benchmark.php
@@ -176,7 +176,7 @@ function test_math(&$result, $count = 99999)
 {
     $timeStart = microtime(true);
 
-    $mathFunctions = array("abs", "acos", "asin", "atan", "bindec", "floor", "exp", "sin", "tan", "pi", "is_finite", "is_nan", "sqrt");
+    $mathFunctions = array("abs", "acos", "asin", "atan", "bindec", "floor", "exp", "sin", "tan", "is_finite", "is_nan", "sqrt");
     for ($i = 0; $i < $count; $i++) {
         foreach ($mathFunctions as $function) {
             call_user_func_array($function, array($i));