diff --git a/src/Init/GridInit.cpp b/src/Init/GridInit.cpp
index 1b8f24c7f..4a0e3fca3 100644
--- a/src/Init/GridInit.cpp
+++ b/src/Init/GridInit.cpp
@@ -182,7 +182,7 @@ PhreeqcMatrix InitialList::prepareGrid(const Rcpp::List &grid_input) {
 
   PhreeqcMatrix pqc_mat = PhreeqcMatrix(database, script);
 
-  this->transport_names = pqc_mat.getSolutionNames(true);
+  this->transport_names = pqc_mat.getSolutionNames();
 
   Rcpp::Function unique_R("unique");
   Rcpp::Function sort_R("sort");