diff --git a/cmd/ctool/core/http_util.go b/cmd/ctool/core/http_util.go
index 1faefc7e3d..715c3c360a 100644
--- a/cmd/ctool/core/http_util.go
+++ b/cmd/ctool/core/http_util.go
@@ -20,6 +20,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 )
 
diff --git a/metrics/librato/client.go b/metrics/librato/client.go
index dc6dc3b86d..eebe20521b 100644
--- a/metrics/librato/client.go
+++ b/metrics/librato/client.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 )