diff --git a/src/org/linphone/LinphonePreferences.java b/src/org/linphone/LinphonePreferences.java
index 03e5cedcf..7f3206d4f 100644
--- a/src/org/linphone/LinphonePreferences.java
+++ b/src/org/linphone/LinphonePreferences.java
@@ -311,7 +311,7 @@ public class LinphonePreferences {
 			LinphoneProxyConfig prxCfg = getProxyConfig(n);
 			if (enabled) {
 				String route = prxCfg.getProxy();
-				if (!route.startsWith("sip:")) {
+				if (!route.contains("sip:")) {
 					route = "sip:" + route;
 				}
 				prxCfg.setRoute(route);