diff --git a/lib/system/inclrtl.nim b/lib/system/inclrtl.nim
index 4193f2bdd9..6bff819e67 100644
--- a/lib/system/inclrtl.nim
+++ b/lib/system/inclrtl.nim
@@ -48,3 +48,7 @@ when defined(nimlocks):
   {.pragma: benign, gcsafe, locks: 0.}
 else:
   {.pragma: benign, gcsafe.}
+
+template since(version, body: untyped) {.dirty.} =
+  when version <= (NimMajor, NimMinor):
+    body