diff --git a/mitmproxy/proxy/config.py b/mitmproxy/proxy/config.py
index cf75830a5..604045a4f 100644
--- a/mitmproxy/proxy/config.py
+++ b/mitmproxy/proxy/config.py
@@ -78,6 +78,7 @@ class ProxyConfig:
         self.check_tcp = None
         self.certstore = None
         self.clientcerts = None
+        self.ssl_insecure = False
         self.openssl_verification_mode_server = None
         self.configure(options, set(options.keys()))
         options.changed.connect(self.configure)