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-rw-r--r--lib/pure/asyncdispatch.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pure/asyncdispatch.nim b/lib/pure/asyncdispatch.nim
index 17fd5f824..d98ca77df 100644
--- a/lib/pure/asyncdispatch.nim
+++ b/lib/pure/asyncdispatch.nim
@@ -1022,7 +1022,7 @@ when defined(windows) or defined(nimdoc):
       raiseOSError(osLastError())
 
     var pcd = cast[PostCallbackDataPtr](allocShared0(sizeof(PostCallbackData)))
-    var flags = WT_EXECUTEINWAITTHREAD.DWORD
+    var flags = WT_EXECUTEINWAITTHREAD.DWORD or WT_EXECUTEONLYONCE.DWORD
 
     proc proccb(fd: AsyncFD, bytesCount: DWORD, errcode: OSErrorCode) =
       closeWaitable(hProcess)