diff -Naur mumble-1.2.3-orig/src/SSL.cpp mumble-1.2.3/src/SSL.cpp
--- mumble-1.2.3-orig/src/SSL.cpp	2011-02-19 23:35:16.000000000 +0200
+++ mumble-1.2.3/src/SSL.cpp	2012-03-05 02:07:38.948209359 +0200
@@ -252,6 +252,11 @@
 	QSslSocket::setDefaultCaCertificates(ql);
 #endif // NO_SYSTEM_CA_OVERRIDE
 
+#if QT_VERSION >= 0x040800
+        // Don't perform on-demand loading of root certificates
+        QSslSocket::setDefaultCaCertificates(QSslSocket::systemCaCertificates());
+#endif
+
 	for (unsigned int i=0;i<sizeof(recommended_cas)/sizeof(recommended_cas[0]);++i) {
 		QSslCertificate cert(recommended_cas[i]);
 		if (! QSslSocket::defaultCaCertificates().contains(cert)) {