diff --git a/packages/mitmproxy/src/lib/interceptor/impl/req/proxy.js b/packages/mitmproxy/src/lib/interceptor/impl/req/proxy.js
index f7f89c1e..f5584718 100644
--- a/packages/mitmproxy/src/lib/interceptor/impl/req/proxy.js
+++ b/packages/mitmproxy/src/lib/interceptor/impl/req/proxy.js
@@ -113,7 +113,7 @@ module.exports = {
       log.info('proxy choice:', JSON.stringify(context.requestCount))
     }
 
-    if (interceptOpt.sni != null) {
+    if (interceptOpt.sni) {
       let unVerifySsl = rOptions.agent.options.rejectUnauthorized === false
 
       rOptions.servername = interceptOpt.sni