diff --git a/acconfig.h b/acconfig.h
index 7da3594d4c..7e6de552ee 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -77,6 +77,8 @@
 #ifdef _WIN32
 	/* don't suck in all of the win32 api */
 #	define WIN32_LEAN_AND_MEAN 1
+
+#	define sleep _sleep
 #endif
 
 #ifndef LDAP_NEEDS_PROTOTYPES