diff --git a/MiniDSP.cpp b/MiniDSP.cpp
index d612d55f..c9ec3e62 100644
--- a/MiniDSP.cpp
+++ b/MiniDSP.cpp
@@ -183,7 +183,7 @@ void MiniDSP::setVolumeDB(float volumeDB) const {
                 return;
         }
 
-        uint8_t SetVolumeCommand[] = {0x42, (int)-2*volumeDB};
+        uint8_t SetVolumeCommand[] = {0x42, (uint8_t)(-2*volumeDB)};
 
         SendCommand(SetVolumeCommand, sizeof(SetVolumeCommand));
 }