diff --git a/cpu/stm32f0/periph/timer.c b/cpu/stm32f0/periph/timer.c
index 8f6f146862..f6fc9608af 100644
--- a/cpu/stm32f0/periph/timer.c
+++ b/cpu/stm32f0/periph/timer.c
@@ -42,7 +42,7 @@ typedef struct {
 static timer_conf_t config[TIMER_NUMOF];
 
 
-int timer_init(tim_t dev, unsigned int ticks_per_us, void (*callback)(int))
+int timer_init(tim_t dev, unsigned long freq, void (*callback)(int))
 {
     TIM_TypeDef *timer;
 
@@ -80,7 +80,7 @@ int timer_init(tim_t dev, unsigned int ticks_per_us, void (*callback)(int))
 
     /* set auto-reload and prescaler values and load new values */
     timer->ARR = TIMER_0_MAX_VALUE;
-    timer->PSC = TIMER_0_PRESCALER * ticks_per_us;
+    timer->PSC = (TIMER_0_FREQ / freq) - 1;
     timer->EGR |= TIM_EGR_UG;
 
     /* enable the timer's interrupt */