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-rwxr-xr-xlib/system/threads.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/system/threads.nim b/lib/system/threads.nim
index 0151755c9..7a60404ac 100755
--- a/lib/system/threads.nim
+++ b/lib/system/threads.nim
@@ -317,7 +317,8 @@ proc joinThreads*[TArg](t: openArray[TThread[TArg]]) =
     var a: array[0..255, TSysThread]
     sysAssert a.len >= t.len, "a.len >= t.len"
     for i in 0..t.high: a[i] = t[i].sys
-    discard WaitForMultipleObjects(t.len, cast[ptr TSysThread](addr(a)), 1, -1)
+    discard WaitForMultipleObjects(t.len.int32, 
+                                   cast[ptr TSysThread](addr(a)), 1, -1)
   else:
     for i in 0..t.high: joinThread(t[i])