diff --git a/src/RcppExports.cpp b/src/RcppExports.cpp
index 87fd8e8..841a4da 100644
--- a/src/RcppExports.cpp
+++ b/src/RcppExports.cpp
@@ -27,13 +27,13 @@ BEGIN_RCPP
 END_RCPP
 }
 // get_crosswalk_cpp
-List get_crosswalk_cpp(StringVector old_unit, StringVector new_unit);
+List get_crosswalk_cpp(std::vector<std::string> old_unit, std::vector<std::string> new_unit);
 RcppExport SEXP _segregation_get_crosswalk_cpp(SEXP old_unitSEXP, SEXP new_unitSEXP) {
 BEGIN_RCPP
     Rcpp::RObject rcpp_result_gen;
     Rcpp::RNGScope rcpp_rngScope_gen;
-    Rcpp::traits::input_parameter< StringVector >::type old_unit(old_unitSEXP);
-    Rcpp::traits::input_parameter< StringVector >::type new_unit(new_unitSEXP);
+    Rcpp::traits::input_parameter< std::vector<std::string> >::type old_unit(old_unitSEXP);
+    Rcpp::traits::input_parameter< std::vector<std::string> >::type new_unit(new_unitSEXP);
     rcpp_result_gen = Rcpp::wrap(get_crosswalk_cpp(old_unit, new_unit));
     return rcpp_result_gen;
 END_RCPP
diff --git a/src/compression.cpp b/src/compression.cpp
index a1f0dae..e66e922 100644
--- a/src/compression.cpp
+++ b/src/compression.cpp
@@ -309,7 +309,7 @@ List compress_compute_cpp(
         _["new_unit"] = results.new_unit);
 }
 
-int find_in_sets(String needle, std::vector<std::set<String>> haystack)
+int find_in_sets(std::string needle, std::vector<std::set<std::string>> haystack)
 {
     for (int i = 0; i < haystack.size(); i++)
     {
@@ -321,9 +321,9 @@ int find_in_sets(String needle, std::vector<std::set<String>> haystack)
 }
 
 // [[Rcpp::export]]
-List get_crosswalk_cpp(StringVector old_unit, StringVector new_unit)
+List get_crosswalk_cpp(std::vector<std::string> old_unit, std::vector<std::string> new_unit)
 {
-    std::vector<std::set<String>> bags;
+    std::vector<std::set<std::string>> bags;
 
     for (int i = 0; i < old_unit.size(); i++)
     {
@@ -357,7 +357,7 @@ List get_crosswalk_cpp(StringVector old_unit, StringVector new_unit)
     List l(bags.size());
     for (int i = 0; i < bags.size(); i++)
     {
-        StringVector bag(bags[i].size());
+        std::vector<std::string> bag(bags[i].size());
         int index = 0;
         for (auto el : bags[i])
         {