diff --git a/ChangeLog.asciidoc b/ChangeLog.asciidoc
index 4236df06e..426f8a662 100644
--- a/ChangeLog.asciidoc
+++ b/ChangeLog.asciidoc
@@ -123,6 +123,7 @@ http://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 * lua: fix interpreter used after unload of a script
 * perl: fix context used after unload of a script
 * python: fix interpreter used after unload of a script
+* relay: add support of Internet Explorer websocket (closes #73)
 * relay: add messages "_buffer_hidden" and "_buffer_unhidden"
 * relay: fix crash on /upgrade received from a client (weechat protocol)
 * relay: add info "relay_client_count" with optional status name as argument
diff --git a/src/plugins/relay/relay-websocket.c b/src/plugins/relay/relay-websocket.c
index e29d12cba..2fe8ace30 100644
--- a/src/plugins/relay/relay-websocket.c
+++ b/src/plugins/relay/relay-websocket.c
@@ -145,7 +145,7 @@ relay_websocket_client_handshake_valid (struct t_relay_client *client)
     value = weechat_hashtable_get (client->http_headers, "Upgrade");
     if (!value)
         return -1;
-    if (strcmp (value, "websocket") != 0)
+    if (weechat_strcasecmp (value, "websocket") != 0)
         return -1;
 
     /* check if we have header "Sec-WebSocket-Key" with non-empty value */