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-rw-r--r--src/libexpr/eval.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 62812f90a..3a9b7a3c0 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -875,7 +875,7 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
if (hasOverrides) {
Value * vOverrides = (*v.attrs)[overrides->second.displ].value;
state.forceAttrs(*vOverrides);
- Bindings * newBnds = state.allocBindings(v.attrs->size() + vOverrides->attrs->size());
+ Bindings * newBnds = state.allocBindings(v.attrs->capacity() + vOverrides->attrs->size());
for (auto & i : *v.attrs)
newBnds->push_back(i);
for (auto & i : *vOverrides->attrs) {