diff --git a/tv_rename.cpp b/tv_rename.cpp
index b4921f4..4f1fb49 100644
--- a/tv_rename.cpp
+++ b/tv_rename.cpp
@@ -81,7 +81,7 @@ searchShow( const string &show, const string &language ) {
 
 #ifndef GUI
 // get show's ID
-string getShowId( string &show, const string &language ) {
+string getShowId( const string &show, const string &language ) {
     size_t order{}, pos{};
     auto search_results = searchShow( show, language );
     for ( const auto &x : search_results ) {
diff --git a/tv_rename.hpp b/tv_rename.hpp
index cd4e721..1036830 100644
--- a/tv_rename.hpp
+++ b/tv_rename.hpp
@@ -57,7 +57,7 @@ void multipleSeasons( const string &path, string &show,
 void allSeasons( const string &path, string &show, const string &language,
                  const string &pattern, const size_t &flags );
 
-string getShowId( string &show, const string &language );
+string getShowId( const string &show, const string &language );
 
 #endif