diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index a2feedf37e58..c05c309ae521 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -441,7 +441,7 @@ pref("network.http.proxy.ssl.connect",true);
 
 // This preference controls whether or not internationalized domain names (IDN)
 // are handled.  IDN requires a nsIIDNService implementation.
-pref("network.enableIDN", false);
+pref("network.enableIDN", true);
 
 // This preference controls whether or not URLs with UTF-8 characters are
 // escaped.  Set this preference to TRUE for strict RFC2396 conformance.