diff --git a/src/lib.rs b/src/lib.rs
index ef574c7..2b6afdb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -98,6 +98,7 @@ use lazy_static::lazy_static;
 use std::net::IpAddr;
 use std::str::FromStr;
 
+#[derive(Debug)]
 pub enum ProxyError {
     InvalidUri(InvalidUri),
     HyperError(Error),