diff --git a/file_checker.go b/file_checker.go
index a1f8a2e..59d80af 100644
--- a/file_checker.go
+++ b/file_checker.go
@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"io/ioutil"
+	"net/url"
 	"strings"
 	"time"
 
@@ -112,3 +113,8 @@ func extractURLs(n *html.Node) []string {
 
 	return stringSetToSlice(ss)
 }
+
+func isURL(s string) bool {
+	u, err := url.Parse(s)
+	return err == nil && (u.Scheme == "http" || u.Scheme == "https")
+}
diff --git a/main.go b/main.go
index fcf39d0..98b2ea1 100644
--- a/main.go
+++ b/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"net/url"
 	"os"
 	"time"
 )
@@ -53,8 +52,3 @@ func main() {
 		os.Exit(1)
 	}
 }
-
-func isURL(s string) bool {
-	u, err := url.Parse(s)
-	return err == nil && (u.Scheme == "http" || u.Scheme == "https")
-}