diff --git a/include/argparse.hpp b/include/argparse.hpp
index 1d57b6d..3754db0 100644
--- a/include/argparse.hpp
+++ b/include/argparse.hpp
@@ -504,7 +504,7 @@ class ArgumentParser {
       for (const auto& arg : aArguments)
         argv.push_back((char*)arg.data());
       argv.push_back(nullptr);
-      return parse_args_internal(argv.size() - 1, argv.data());
+      return parse_args_internal(int(argv.size()) - 1, argv.data());
     }
 
     void parse_args_internal(int argc, char * argv[]) {
@@ -689,4 +689,4 @@ class ArgumentParser {
     std::map<std::string, std::shared_ptr<Argument>> mArgumentMap;
 };
 
-}
\ No newline at end of file
+}