diff --git a/xmpp.go b/xmpp.go
index 64aed6f..89e6e6e 100644
--- a/xmpp.go
+++ b/xmpp.go
@@ -94,6 +94,9 @@ func connect(host, user, passwd string) (net.Conn, error) {
 	// test for no proxy
 	if proxy != "" {
 		noproxy := os.Getenv("no_proxy")
+		if noproxy == "" {
+			noproxy = os.Getenv("NO_PROXY")
+		}
 		if noproxy != "" {
 			nplist := strings.Split(noproxy, ",")
 			for _, s := range nplist {