diff --git a/cpu_darwin.go b/cpu_darwin.go
index bb1a4fd7..6d2ba56b 100644
--- a/cpu_darwin.go
+++ b/cpu_darwin.go
@@ -3,6 +3,7 @@
 package gopsutil
 
 import (
+	"fmt"
 	"os/exec"
 	"strconv"
 	"strings"