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-rw-r--r--src/libexpr/primops.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index ae17506ceed9..c4495e81db49 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -733,7 +733,7 @@ static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
         if (j == v2.attrs->end())
             throw TypeError("`value' attribute missing in a call to `listToAttrs'");
 
-        (*v.attrs)[state.symbols.create(name)] = j->second; // !!! sharing?
+        mkCopy((*v.attrs)[state.symbols.create(name)], j->second);
     }
 }