diff --git a/minichlink/minichlink.c b/minichlink/minichlink.c
index cc82d575f561a4cfa919dd70cc7e550d4bbdd13a..52b087c7bd5885f4f31ae201be0bdb3a7d9ba8cc 100644
--- a/minichlink/minichlink.c
+++ b/minichlink/minichlink.c
@@ -12,6 +12,7 @@
 #include "../ch32v003fun/ch32v003fun.h"
 
 #if defined(WINDOWS) || defined(WIN32) || defined(_WIN32)
+void Sleep(uint32_t dwMilliseconds);
 #else
 #include <unistd.h>
 #endif