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-rw-r--r--src/mongo/db/pipeline/expression.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mongo/db/pipeline/expression.cpp b/src/mongo/db/pipeline/expression.cpp
index 1f7e363df8d..4f4c893fd17 100644
--- a/src/mongo/db/pipeline/expression.cpp
+++ b/src/mongo/db/pipeline/expression.cpp
@@ -1200,7 +1200,7 @@ intrusive_ptr<ExpressionObject> ExpressionObject::create(
intrusive_ptr<ExpressionObject> ExpressionObject::parse(BSONObj obj,
const VariablesParseState& vps) {
// Make sure we don't have any duplicate field names.
- std::unordered_set<string> specifiedFields;
+ stdx::unordered_set<string> specifiedFields;
vector<pair<string, intrusive_ptr<Expression>>> expressions;
for (auto&& elem : obj) {