1 files changed, 1 insertions, 1 deletions
diff --git a/src/mongo/db/pipeline/window_function/window_function_covariance_test.cpp b/src/mongo/db/pipeline/window_function/window_function_covariance_test.cpp
index 9d1b296a1ef..a170bb97be8 100644
--- a/src/mongo/db/pipeline/window_function/window_function_covariance_test.cpp
+++ b/src/mongo/db/pipeline/window_function/window_function_covariance_test.cpp
@@ -53,7 +53,7 @@ public:
 
 void addToWindowCovariance(WindowFunctionCovariance* covariance,
                            const std::vector<Value>& valToAdd) {
-    for (auto val : valToAdd) {
+    for (const auto& val : valToAdd) {
         covariance->add(val);
     }
 }