diff --git a/winsup/cygwin/winsup.h b/winsup/cygwin/winsup.h
index 4b2344cc4..9b7e04075 100644
--- a/winsup/cygwin/winsup.h
+++ b/winsup/cygwin/winsup.h
@@ -242,6 +242,7 @@ extern void multiple_cygwin_problem (const char *, unsigned, unsigned);
 class path_conv;
 int __stdcall stat_worker (const char *name, struct __stat64 *buf, int nofollow,
 			   path_conv *pc = NULL) __attribute__ ((regparm (3)));
+void __stdcall low_priority_sleep (DWORD) __attribute__ ((regparm (1)));
 
 /**************************** Exports ******************************/