diff --git a/src/fileio/fileio.hpp b/src/fileio/fileio.hpp
index 766b235d..e1221eeb 100644
--- a/src/fileio/fileio.hpp
+++ b/src/fileio/fileio.hpp
@@ -21,7 +21,7 @@ class cUniverse;
 fs::path locate_scenario(std::string scen_name);
 bool load_scenario(fs::path file_to_load, cScenario& scenario, bool only_header = false);
 
-bool load_party(fs::path file_to_load, cUniverse& univ);
+bool load_party(fs::path const &file_to_load, cUniverse& univ);
 bool save_party(fs::path dest_file, const cUniverse& univ);
 
 void init_directories(const char* exec_path);
diff --git a/src/fileio/fileio_party.cpp b/src/fileio/fileio_party.cpp
index cc5dd274..0662a674 100644
--- a/src/fileio/fileio_party.cpp
+++ b/src/fileio/fileio_party.cpp
@@ -24,10 +24,10 @@ extern fs::path progDir, tempDir;
 extern cCustomGraphics spec_scen_g;
 
 // Load saved games
-static bool load_party_v1(fs::path file_to_load, cUniverse& univ, bool town_restore, bool in_scen, bool maps_there, bool mac_file);
-static bool load_party_v2(fs::path file_to_load, cUniverse& univ);
+static bool load_party_v1(fs::path const &file_to_load, cUniverse& univ, bool town_restore, bool in_scen, bool maps_there, bool mac_file);
+static bool load_party_v2(fs::path const &file_to_load, cUniverse& univ);
 
-bool load_party(fs::path file_to_load, cUniverse& univ){
+bool load_party(fs::path const &file_to_load, cUniverse& univ){
 	bool town_restore = false;
 	bool maps_there = false;
 	bool in_scen = false;
@@ -105,7 +105,7 @@ bool load_party(fs::path file_to_load, cUniverse& univ){
 	return true;
 }
 
-bool load_party_v1(fs::path file_to_load, cUniverse& real_univ, bool town_restore, bool in_scen, bool maps_there, bool mac_file){
+bool load_party_v1(fs::path const &file_to_load, cUniverse& real_univ, bool town_restore, bool in_scen, bool maps_there, bool mac_file){
 	std::ifstream fin(file_to_load.string().c_str(), std::ios_base::binary);
 	fin.seekg(3*sizeof(short),std::ios_base::beg); // skip the header, which is 6 bytes in the old format
 	
@@ -256,7 +256,7 @@ bool load_party_v1(fs::path file_to_load, cUniverse& real_univ, bool town_restor
 }
 
 extern fs::path scenDir;
-bool load_party_v2(fs::path file_to_load, cUniverse& real_univ){
+bool load_party_v2(fs::path const &file_to_load, cUniverse& real_univ){
 	igzstream zin(file_to_load.string().c_str());
 	tarball partyIn;
 	partyIn.readFrom(zin);