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-rw-r--r--src/libexpr/primops.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 6d09bb7b13ba..4f836e279425 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -1242,7 +1242,7 @@ void EvalState::createBaseEnv()
        language feature gets added.  It's not necessary to increase it
        when primops get added, because you can just use `builtins ?
        primOp' to check. */
-    mkInt(v, 1);
+    mkInt(v, 2);
     addConstant("__langVersion", v);
 
     // Miscellaneous