1 files changed, 5 insertions, 5 deletions
diff --git a/src/countries.cpp b/src/countries.cpp
index 5d1ea5a..5384889 100644
--- a/src/countries.cpp
+++ b/src/countries.cpp
@@ -258,7 +258,7 @@ bool country::is_enabled(const char* country_code)
     return country_map[index].enabled;
 }
 
-time_t country::get_default_invoice_expire_duration(char* country_code)
+time_t country::get_default_invoice_expire_duration(const char* country_code)
 {
     s32 index = get_index_by_country_code(country_code);
     if (index == -1) return 0;
@@ -275,7 +275,7 @@ bool country::tax_is_implemented(const char* country_code)
         country_map[index].add_billing_item_to_tax_report && country_map[index].get_available_tax_rates;
 }
 
-void country::fill_tax_report_with_categories(char* country_code, tax_report* report)
+void country::fill_tax_report_with_categories(const char* country_code, tax_report* report)
 {
     s32 index = get_index_by_country_code(country_code);
     assert(index != -1);
@@ -283,7 +283,7 @@ void country::fill_tax_report_with_categories(char* country_code, tax_report* re
     country_map[index].fill_tax_report_with_categories(report);
 }
 
-bool country::add_billing_item_to_tax_report(char* country_code, tax_report* report, invoice* inv, billing_item* item)
+bool country::add_billing_item_to_tax_report(const char* country_code, tax_report* report, invoice* inv, billing_item* item)
 {
     s32 index = get_index_by_country_code(country_code);
     assert(index != -1);
@@ -291,7 +291,7 @@ bool country::add_billing_item_to_tax_report(char* country_code, tax_report* rep
     return country_map[index].add_billing_item_to_tax_report(report, inv, item);
 }
 
-float country::calculate_tax_report_final(char* country_code, tax_report* report)
+float country::calculate_tax_report_final(const char* country_code, tax_report* report)
 {
     s32 index = get_index_by_country_code(country_code);
     assert(index != -1);
@@ -299,7 +299,7 @@ float country::calculate_tax_report_final(char* country_code, tax_report* report
     return country_map[index].calculate_tax_report_final(report);
 }
 
-time_t country::get_invoice_date_to_use_for_tax_report(char* country_code, invoice* inv)
+time_t country::get_invoice_date_to_use_for_tax_report(const char* country_code, invoice* inv)
 {
     s32 index = get_index_by_country_code(country_code);
     assert(index != -1);