diff --git a/src/noolite.cpp b/src/noolite.cpp
index 5be55d6..82301cb 100644
--- a/src/noolite.cpp
+++ b/src/noolite.cpp
@@ -16,9 +16,9 @@ constexpr auto PID = 0x05df;
 namespace
 {
 
-constexpr char WorkMode = 0;
-constexpr char Bitrate = 2;
-constexpr char Repeats = 2;
+constexpr auto WorkMode = 0;
+constexpr auto Bitrate = 2;
+constexpr auto Repeats = 2;
 
 constexpr auto Mode = (Repeats << 5 | Bitrate << 3 | WorkMode);