diff --git a/cpu/stm32/periph/timer.c b/cpu/stm32/periph/timer.c
index fb94897eed..d407421e99 100644
--- a/cpu/stm32/periph/timer.c
+++ b/cpu/stm32/periph/timer.c
@@ -50,7 +50,6 @@ static unsigned channel_numof(tim_t tim)
     return TIMER_CHANNEL_NUMOF;
 }
 
-
 #ifdef MODULE_PERIPH_TIMER_PERIODIC
 
 /**
@@ -238,7 +237,7 @@ int timer_set_periodic(tim_t tim, int channel, unsigned int value, uint8_t flags
         dev(tim)->CNT = 0;
 
         /* wait for the interrupt & clear it */
-        while(dev(tim)->SR == 0) {}
+        while (dev(tim)->SR == 0) {}
         dev(tim)->SR = 0;
     }