diff --git a/che_close/func_process.php b/che_close/func_process.php
index b751b86..4b719eb 100644
--- a/che_close/func_process.php
+++ b/che_close/func_process.php
@@ -132,8 +132,8 @@ function CriticalRatioDomestic(&$general, $type) {
     }
     $ratio = min($ratio, 1.2);
 
-    $fail = power($ratio / 1.2, 1.4) - 0.3;
-    $succ = power($ratio / 1.2, 1.5) - 0.25;
+    $fail = pow($ratio / 1.2, 1.4) - 0.3;
+    $succ = pow($ratio / 1.2, 1.5) - 0.25;
 
     $fail = min(max($fail, 0), 0.5);
     $succ = min(max($succ, 0), 0.5);