Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -130,11 +130,12 @@
 		DWORD dwActiveProtocol;
 		LONG scard_conn_ret, scard_est_context_ret;
 
 		scard_est_context_ret = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &hContext);
 
-		scard_conn_ret = SCardConnect(hContext, "Reader X", SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0, &hCard, &dwActiveProtocol);
+		hCard = NULL;
+		scard_conn_ret = SCardConnect(hContext, "Reader X", SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0, hCard, &dwActiveProtocol);
 	]]), [
 		AC_MSG_RESULT(okay)
 	], [
 		AC_MSG_RESULT(failed)