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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 2726fd971d45..6912e22887fd 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -106,6 +106,7 @@ struct Value
 struct Env
 {
     Env * up;
+    unsigned int prevWith; // nr of levels up to next `with' environment
     Value values[0];
 };