diff --git a/src/Tools/cpp_out/src/main.rs b/src/Tools/cpp_out/src/main.rs
index 5340f6a1..3a2e62dd 100644
--- a/src/Tools/cpp_out/src/main.rs
+++ b/src/Tools/cpp_out/src/main.rs
@@ -5,7 +5,7 @@ use cpp_out::{Configuration, Error, FileType};
 #[derive(Parser)]
 #[clap(about = "Output a file content or stdin to a c++ header/source file", long_about = None)]
 struct CommandLine {
-    #[clap(short='f', long="file")]
+    #[clap(value_parser)]
     input_file: Option<PathBuf>,
 
     #[clap(short='n', long="name")]