diff --git a/left/src/bootloader_config.c b/left/src/bootloader_config.c
index 30c8856..9bac24f 100644
--- a/left/src/bootloader_config.c
+++ b/left/src/bootloader_config.c
@@ -6,6 +6,6 @@ __attribute__((used, section(".BootloaderConfig"))) const bootloader_config_t Bo
     .enabledPeripherals = EnabledBootloaderPeripherial_I2c,
     .i2cSlaveAddress = I2C_ADDRESS_LEFT_KEYBOARD_HALF_BOOTLOADER,
     .peripheralDetectionTimeoutMs = BOOTLOADER_TIMEOUT_MS,
-    .clockFlags = 0xFF,    // Disable High speed mode
-    .clockDivider = 0xFF,  // Use clock divider (0)
+    .clockFlags = CLOCK_FLAG_HIGH_SPEED_MODE,
+    .clockDivider = ~0
 };
diff --git a/shared/bootloader.h b/shared/bootloader.h
index c463d53..aa6233f 100644
--- a/shared/bootloader.h
+++ b/shared/bootloader.h
@@ -10,6 +10,7 @@
 
     #define BOOTLOADER_TAG 0x6766636B
     #define BOOTLOADER_TIMEOUT_MS 100
+    #define CLOCK_FLAG_HIGH_SPEED_MODE 0x01
 
 // Typedefs: