diff -u b/includes/math-expr.inc b/includes/math-expr.inc
--- b/includes/math-expr.inc
+++ b/includes/math-expr.inc
@@ -13,7 +13,7 @@
     'sin', 'sinh', 'asin', 'asinh',
     'cos', 'cosh', 'acos', 'acosh',
     'tan', 'tanh', 'atan', 'atanh',
-    'pow', 'exp',
+    'exp',
     'sqrt', 'abs', 'log',
     'time', 'ceil', 'floor', 'round'
   );
@@ -56,6 +56,10 @@
       'arguments' => 2,
       'max arguments' => 99,
     ),
+    'pow' => array(
+      'function' => 'pow',
+      'arguments' => 2,
+    ),
     'if' => array(
       'function' => 'ctools_math_expr_if',
       'arguments' => 2,