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-rw-r--r--src/libexpr/eval.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index a3aeeb55c02c..59c42d0b0d6e 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -639,7 +639,7 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
         state.forceValue(*vAttrs);
 
     } catch (Error & e) {
-        if (pos)
+        if (pos && pos->file != state.sDerivationNix)
             addErrorPrefix(e, "while evaluating the attribute `%1%' at %2%:\n",
                 showAttrPath(attrPath), *pos);
         throw;