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-rw-r--r--lib/system/threads.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/system/threads.nim b/lib/system/threads.nim
index b09ed0c6f..1f955307b 100644
--- a/lib/system/threads.nim
+++ b/lib/system/threads.nim
@@ -327,7 +327,7 @@ else:
       var s {.noinit.}: CpuSet
       cpusetZero(s)
       cpusetIncl(cpu.cint, s)
-      setAffinity(t.sys, sizeof(s), s)
+      setAffinity(t.sys, csize_t(sizeof(s)), s)
 
 proc createThread*(t: var Thread[void], tp: proc () {.thread, nimcall.}) =
   createThread[void](t, tp)