diff --git a/include/Swiften/TLS/Schannel/SchannelServerContext.cpp b/include/Swiften/TLS/Schannel/SchannelServerContext.cpp
index 40ccd6e22f4b317e0c0d818c384bf54191858921..96c090b55f3c39f0c325ba24aaf734313319b780 100644
--- a/include/Swiften/TLS/Schannel/SchannelServerContext.cpp
+++ b/include/Swiften/TLS/Schannel/SchannelServerContext.cpp
@@ -60,7 +60,7 @@ void SchannelServerContext::connect()
 	{
 		if (m_my_cert_store == NULL)
 		{
-			m_my_cert_store = CertOpenSystemStore(0, m_cert_store_name.c_str());
+			m_my_cert_store = CertOpenSystemStoreA(0, m_cert_store_name.c_str());
 			if (!m_my_cert_store)
 			{
 /////			printf( "**** Error 0x%x returned by CertOpenSystemStore\n", GetLastError() );