diff --git a/virtualsmartcard/src/pcsclite-vpcd/winscard.c b/virtualsmartcard/src/pcsclite-vpcd/winscard.c
index 022d883..3ca8843 100644
--- a/virtualsmartcard/src/pcsclite-vpcd/winscard.c
+++ b/virtualsmartcard/src/pcsclite-vpcd/winscard.c
@@ -20,6 +20,10 @@
 #include <config.h>
 #endif
 
+#ifdef _WIN32
+#define sleep(s) Sleep((s*1000))
+#endif
+
 #include "ifd-vpcd.h"
 #include "vpcd.h"
 #include <ifdhandler.h>