diff --git a/eval/builtin_func.go b/eval/builtin_func.go
index af9a9862..de530102 100644
--- a/eval/builtin_func.go
+++ b/eval/builtin_func.go
@@ -8,7 +8,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"math"
 	"os"
 	"reflect"
 	"runtime"
@@ -81,7 +80,6 @@ func init() {
 		&BuiltinFn{"-", wrapFn(minus)},
 		&BuiltinFn{"mul", wrapFn(times)},
 		&BuiltinFn{"div", wrapFn(divide)},
-		&BuiltinFn{"pow", wrapFn(pow)},
 		&BuiltinFn{"lt", wrapFn(lt)},
 		&BuiltinFn{"gt", wrapFn(gt)},
 
@@ -494,11 +492,6 @@ func divide(ec *EvalCtx, prod float64, nums ...float64) {
 	out <- String(fmt.Sprintf("%g", prod))
 }
 
-func pow(ec *EvalCtx, b, p float64) {
-	out := ec.ports[1].Chan
-	out <- String(fmt.Sprintf("%g", math.Pow(b, p)))
-}
-
 var ErrFalse = errors.New("false")
 
 func lt(ec *EvalCtx, nums ...float64) {