diff --git a/quinn-proto/src/endpoint.rs b/quinn-proto/src/endpoint.rs
index ae8b1f810..ff468005e 100644
--- a/quinn-proto/src/endpoint.rs
+++ b/quinn-proto/src/endpoint.rs
@@ -1,7 +1,7 @@
 use std::{
     collections::{HashMap, VecDeque},
     convert::TryFrom,
-    fmt, iter,
+    fmt, io, iter,
     net::{IpAddr, SocketAddr},
     ops::{Index, IndexMut},
     sync::Arc,
@@ -844,6 +844,19 @@ pub enum ConnectError {
     UnsupportedVersion,
 }
 
+// For compatibility with API consumers
+impl From<ConnectError> for io::Error {
+    fn from(x: ConnectError) -> io::Error {
+        use ConnectError::*;
+        let kind = match x {
+            InvalidDnsName(_) | InvalidRemoteAddress(_) => io::ErrorKind::InvalidData,
+            EndpointStopping | TooManyConnections | NoDefaultClientConfig => io::ErrorKind::Other,
+            UnsupportedVersion => io::ErrorKind::InvalidInput,
+        };
+        io::Error::new(kind, x)
+    }
+}
+
 /// Reset Tokens which are associated with peer socket addresses
 ///
 /// The standard `HashMap` is used since both `SocketAddr` and `ResetToken` are