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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 070ed1b54aa7..938d9bb8c13b 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -205,7 +205,7 @@ static Expr primDerivation(EvalState & state, const ATermVector & _args)
         try {
             processBinding(state, value, ne, ss);
         } catch (Error & e) {
-            throw Error(format("while processing derivation attribute `%1%' at %2%:\n%3%")
+            throw Error(format("while processing the derivation attribute `%1%' at %2%:\n%3%")
                 % key % showPos(pos) % e.msg());
         }