diff --git a/duckpgq/src/duckpgq/functions/scalar/cheapest_path_length.cpp b/duckpgq/src/duckpgq/functions/scalar/cheapest_path_length.cpp
index b751de2c..8c8ba0b3 100644
--- a/duckpgq/src/duckpgq/functions/scalar/cheapest_path_length.cpp
+++ b/duckpgq/src/duckpgq/functions/scalar/cheapest_path_length.cpp
@@ -51,7 +51,7 @@ bool UpdateLanes(vector<vector<T>> &dists, T v, T n, T weight) {
 template <typename T, int16_t lane_limit>
 int16_t
 TemplatedBatchBellmanFord(CSR *csr, DataChunk &args, int64_t input_size,
-                          UnifiedVectorFormat vdata_src, int64_t *src_data,
+                          UnifiedVectorFormat &vdata_src, int64_t *src_data,
                           const UnifiedVectorFormat &vdata_target,
                           int64_t *target_data, std::vector<T> weight_array,
                           int16_t result_size, T *result_data,
@@ -94,7 +94,7 @@ TemplatedBatchBellmanFord(CSR *csr, DataChunk &args, int64_t input_size,
 
 template <typename T>
 void TemplatedBellmanFord(CSR *csr, DataChunk &args, int64_t input_size,
-                          Vector &result, UnifiedVectorFormat vdata_src,
+                          Vector &result, UnifiedVectorFormat &vdata_src,
                           int64_t *src_data,
                           const UnifiedVectorFormat &vdata_target,
                           int64_t *target_data, std::vector<T> weight_array) {