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-rw-r--r--src/libstore/builtins.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/builtins.cc b/src/libstore/builtins.cc
index c2763f1ab4d8..6383ab59ea02 100644
--- a/src/libstore/builtins.cc
+++ b/src/libstore/builtins.cc
@@ -23,7 +23,7 @@ void builtinFetchurl(const BasicDerivation & drv)
     assert(data.data);
 
     auto out = drv.env.find("out");
-    if (out == drv.env.end()) throw Error("attribute ‘url’ missing");
+    if (out == drv.env.end()) throw Error("attribute ‘out’ missing");
 
     Path storePath = out->second;