diff --git a/boards/nucleo-f031k6/include/periph_conf.h b/boards/nucleo-f031k6/include/periph_conf.h
index e7f5da4bcb..a51f9814b2 100644
--- a/boards/nucleo-f031k6/include/periph_conf.h
+++ b/boards/nucleo-f031k6/include/periph_conf.h
@@ -20,14 +20,6 @@
 #ifndef PERIPH_CONF_H
 #define PERIPH_CONF_H
 
-/* Adjust PLL factors:
-  - On nucleo-f031k6, there's no HSE and PREDIV is hard-wired to 2
-  - to reach 48MHz set PLL_MUL to 12 so core clock = (HSI8 / 2) * 12 = 48MHz */
-#define CONFIG_CLOCK_PLL_PREDIV     (2)
-#ifndef CONFIG_CLOCK_PLL_MUL
-#define CONFIG_CLOCK_PLL_MUL        (12)
-#endif
-
 #include "periph_cpu.h"
 #include "f0/cfg_clock_default.h"
 #include "cfg_timer_tim2.h"
diff --git a/boards/nucleo-f042k6/include/periph_conf.h b/boards/nucleo-f042k6/include/periph_conf.h
index e409716013..f70473b546 100644
--- a/boards/nucleo-f042k6/include/periph_conf.h
+++ b/boards/nucleo-f042k6/include/periph_conf.h
@@ -19,14 +19,6 @@
 #ifndef PERIPH_CONF_H
 #define PERIPH_CONF_H
 
-/* Adjust PLL factors:
-  - On nucleo-f042k6, there's no HSE and PREDIV is hard-wired to 2
-  - to reach 48MHz set PLL_MUL to 12 so core clock = (HSI8 / 2) * 12 = 48MHz */
-#define CONFIG_CLOCK_PLL_PREDIV     (2)
-#ifndef CONFIG_CLOCK_PLL_MUL
-#define CONFIG_CLOCK_PLL_MUL        (12)
-#endif
-
 #include "periph_cpu.h"
 #include "f0/cfg_clock_default.h"
 #include "cfg_timer_tim2.h"