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-rw-r--r--src/libexpr/eval.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index fe91db2efd70..0491fc481f03 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -244,6 +244,7 @@ private:
 
     friend class ExprVar;
     friend class ExprAttrs;
+    friend class ExprLet;
 
 public: