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-rw-r--r--lib/pure/includes/oserr.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pure/includes/oserr.nim b/lib/pure/includes/oserr.nim
index bfb6118f2..eb350cbd4 100644
--- a/lib/pure/includes/oserr.nim
+++ b/lib/pure/includes/oserr.nim
@@ -66,7 +66,7 @@ proc raiseOSError*(errorCode: OSErrorCode; additionalInfo = "") {.noinline.} =
   raise e
 
 {.push stackTrace:off.}
-proc osLastError*(): OSErrorCode =
+proc osLastError*(): OSErrorCode {.sideEffect.} =
   ## Retrieves the last operating system error code.
   ##
   ## This procedure is useful in the event when an OS call fails. In that case