diff --git a/src/engine/platform/sound/pokey/AltASAP.cpp b/src/engine/platform/sound/pokey/AltASAP.cpp
index ec5bbf74..65ad339a 100644
--- a/src/engine/platform/sound/pokey/AltASAP.cpp
+++ b/src/engine/platform/sound/pokey/AltASAP.cpp
@@ -36,7 +36,6 @@ namespace
 static constexpr int64_t CNT_MAX = std::numeric_limits<int64_t>::max() & ~7;
 static constexpr int MuteFrequency = 1;
 static constexpr int MuteInit = 2;
-static constexpr int MuteUser = 4;
 static constexpr int MuteSerialInput = 8;
 
 struct PokeyBase