diff --git a/src/cli_interface.cpp b/src/cli_interface.cpp
index e51bc07..bfc9f5e 100644
--- a/src/cli_interface.cpp
+++ b/src/cli_interface.cpp
@@ -141,7 +141,7 @@ namespace Hanabi {
         return true;
     }
 
-    void signal_handler(int signal) {
+    void signal_handler(int) {
         std::cout << "Use 'quit' to exit the interactive shell." << std::endl << "> ";
     }