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-rw-r--r--src/libexpr/eval.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index eb55f6d4d431..2d7b7bcdcb62 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -69,7 +69,7 @@ public:
 
     const Symbol sWith, sOutPath, sDrvPath, sType, sMeta, sName, sValue,
         sSystem, sOverrides, sOutputs, sOutputName, sIgnoreNulls,
-        sFile, sLine, sColumn, sFunctor;
+        sFile, sLine, sColumn, sFunctor, sToString;
     Symbol sDerivationNix;
 
     /* If set, force copying files to the Nix store even if they