diff --git a/plugins/Kaleidoscope-FocusSerial/src/kaleidoscope/plugin/FocusSerial.cpp b/plugins/Kaleidoscope-FocusSerial/src/kaleidoscope/plugin/FocusSerial.cpp
index d209beb9..dd5ee3c4 100644
--- a/plugins/Kaleidoscope-FocusSerial/src/kaleidoscope/plugin/FocusSerial.cpp
+++ b/plugins/Kaleidoscope-FocusSerial/src/kaleidoscope/plugin/FocusSerial.cpp
@@ -32,6 +32,8 @@ EventHandlerResult FocusSerial::afterEachCycle() {
     return EventHandlerResult::OK;
 
   uint8_t i = 0;
+  memset(command_, 0, sizeof(command_));
+
   do {
     command_[i++] = Runtime.serialPort().read();