diff --git a/ArchiSteamFarm/Program.cs b/ArchiSteamFarm/Program.cs
index 838714279..795c56bb4 100644
--- a/ArchiSteamFarm/Program.cs
+++ b/ArchiSteamFarm/Program.cs
@@ -468,6 +468,8 @@ internal static class Program {
 				await Exit().ConfigureAwait(false);
 
 				break;
+			default:
+				throw new InvalidOperationException(nameof(signal.Signal));
 		}
 	}
 #endif