diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6f24694..7ec7112 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -34,7 +34,7 @@ endif()
 if(NOT TARGET upload)
 # Upload command (adjust according to your programmer)
 add_custom_target(upload ALL
-    COMMAND avrdude -c ${PROGRAMMER} -P ${PORT} -p ${AVR_MCU} -U flash:w:${CMAKE_PROJECT_NAME}.hex
+    COMMAND avrdude -c ${PROGRAMMER} -P ${PORT} -p ${AVR_MCU} -B 125kHz -U flash:w:${CMAKE_PROJECT_NAME}.hex
     DEPENDS hex
 )
 endif()