diff --git a/src/lib/empthread/ntthread.c b/src/lib/empthread/ntthread.c
index bc2e9d9c..4f736949 100644
--- a/src/lib/empthread/ntthread.c
+++ b/src/lib/empthread/ntthread.c
@@ -601,7 +601,7 @@ empth_sleep(time_t until)
     empth_t *pThread = TlsGetValue(dwTLSIndex);
     int iReturn = 0;
 
-    if ((lSec = until - time(0)) > 0) {
+    while (!iReturn && ((lSec = until - time(0)) > 0)) {
 	loc_BlockThisThread();
 	loc_debug("going to sleep %ld sec", lSec);