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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 96bda43a322a..e55f28822b6a 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -39,7 +39,7 @@ std::ostream & operator << (std::ostream & str, const Value & v)
         str << v.path; // !!! escaping?
         break;
     case tNull:
-        str << "true";
+        str << "null";
         break;
     case tAttrs: {
         str << "{ ";