diff --git a/config.mk b/config.mk
index 5d4041ca7ff6aa4b7f800b42a58a2ce0e975da3a..6e2af7a71dedbfb17e37710cba59edd36c48bcd8 100644
--- a/config.mk
+++ b/config.mk
@@ -41,7 +41,7 @@ BUILD_DIR =
 
 # Microcontroller: atxmega128a1, atmega128, attiny261, etc.
 MCU = atxmega256a3u
-F_CPU = 32000000
+F_CPU = 48000000
 
 # Programming settings
 AVRDUDE_DEV = x256a3u
diff --git a/src/config/conf_clock.h b/src/config/conf_clock.h
index 8f6349c685bc39e54b40ecf122e3ee63da354c92..f53945fd3d01db0b4d3563bd6ce62d8958cb1e1b 100644
--- a/src/config/conf_clock.h
+++ b/src/config/conf_clock.h
@@ -44,9 +44,9 @@
 #define CONF_CLOCK_H_INCLUDED
 
 #include "conf_board.h"
-
+//
 #if BOARD_VER_MAJOR >= 1 && BOARD_VER_MINOR >= 2 && BOARD_VER_MICRO >= 3
-    #define CONFIG_SYSCLK_SOURCE            SYSCLK_SRC_RC32MHZ
+    #define CONFIG_SYSCLK_SOURCE            SYSCLK_SRC_PLL
 
     #define CONFIG_SYSCLK_PSADIV            SYSCLK_PSADIV_1
     #define CONFIG_SYSCLK_PSBCDIV           SYSCLK_PSBCDIV_1_1