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-rw-r--r--compiler/nim.cfg5
1 files changed, 4 insertions, 1 deletions
diff --git a/compiler/nim.cfg b/compiler/nim.cfg
index 43da7e3e0..ce5a22ad2 100644
--- a/compiler/nim.cfg
+++ b/compiler/nim.cfg
@@ -9,7 +9,6 @@ define:nimPreviewSlimSystem
 define:nimPreviewCstringConversion
 define:nimPreviewProcConversion
 define:nimPreviewRangeDefault
-define:nimPreviewVtables
 define:nimPreviewNonVarDestructor
 threads:off
 
@@ -58,3 +57,7 @@ define:useStdoutAsStdmsg
   warning[StdPrefix]:on
   warningAsError[StdPrefix]:on
 @end
+
+@if nimHasVtables:
+  experimental:vtables
+@end