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-rw-r--r--nix/libstore/local-store.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/nix/libstore/local-store.cc b/nix/libstore/local-store.cc
index d52b102343..0883a4bbce 100644
--- a/nix/libstore/local-store.cc
+++ b/nix/libstore/local-store.cc
@@ -839,7 +839,8 @@ template<class T> T LocalStore::getIntLineFromSubstituter(Agent & run)
{
string s = getLineFromSubstituter(run);
T res;
- if (!string2Int(s, res)) throw Error("integer expected from stream");
+ if (!string2Int(s, res))
+ throw Error(format("integer expected from stream: %1%") % s);
return res;
}