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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 14e5cab7de60..1ee6c5a7f6aa 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -16,7 +16,7 @@
 namespace nix {
     
 
-std::ostream & operator << (std::ostream & str, Value & v)
+std::ostream & operator << (std::ostream & str, const Value & v)
 {
     switch (v.type) {
     case tInt: