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-rw-r--r--compiler/nim.cfg4
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/nim.cfg b/compiler/nim.cfg
index 96b47b0e6..b9c8fdc08 100644
--- a/compiler/nim.cfg
+++ b/compiler/nim.cfg
@@ -31,6 +31,10 @@ define:useStdoutAsStdmsg
   warning[ObservableStores]:off
 @end
 
+@if nimHasWarnCastSizes:
+  warning[CastSizes]:on
+@end
+
 @if nimHasWarningAsError:
   warningAsError[GcUnsafe2]:on
 @end