diff --git a/file.go b/file.go
index c5a6d4273..e73572300 100644
--- a/file.go
+++ b/file.go
@@ -30,7 +30,9 @@ func (f *File) Contents() (content string, err error) {
 	defer checkClose(reader, &err)
 
 	buf := new(bytes.Buffer)
-	buf.ReadFrom(reader)
+	if _, err := buf.ReadFrom(reader); err != nil {
+		return "", err
+	}
 
 	return buf.String(), nil
 }