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-rw-r--r--src/libexpr/value.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/value.hh b/src/libexpr/value.hh
index c9ec236c470d..91b4f78fa65c 100644
--- a/src/libexpr/value.hh
+++ b/src/libexpr/value.hh
@@ -131,7 +131,7 @@ static inline void mkStringNoCopy(Value & v, const char * s)
 
 static inline void mkString(Value & v, const Symbol & s)
 {
-    mkStringNoCopy(v, ((string) s).c_str());
+    mkStringNoCopy(v, ((const string &) s).c_str());
 }