diff --git a/boards/nucleo-f103/include/board.h b/boards/nucleo-f103/include/board.h
index 977e053d9e..7641bd1b37 100755
--- a/boards/nucleo-f103/include/board.h
+++ b/boards/nucleo-f103/include/board.h
@@ -35,9 +35,8 @@ extern "C" {
 /**
  * @name xtimer configuration
  */
-#define XTIMER_MASK                 (0xffff0000)
-#define XTIMER_BACKOFF              5
-#define XTIMER_SHIFT_ON_COMPARE     (1)
+#define XTIMER_MASK         (0xffff0000)
+#define XTIMER_BACKOFF      5
 /** @} */
 
 #ifdef __cplusplus
diff --git a/cpu/stm32f1/periph/timer.c b/cpu/stm32f1/periph/timer.c
index 30933f883a..e57d9b53cb 100644
--- a/cpu/stm32f1/periph/timer.c
+++ b/cpu/stm32f1/periph/timer.c
@@ -56,7 +56,7 @@ int timer_init(tim_t tim, unsigned long freq, timer_cb_t cb, void *arg)
     dev(tim)->CR2  = 0;
     dev(tim)->ARR  = TIMER_MAXVAL;
     /* set prescaler */
-    dev(tim)->PSC = (((CLOCK_CORECLOCK) / freq) - 1);
+    dev(tim)->PSC = ((CLOCK_CORECLOCK / freq) - 1);
     /* generate an update event to apply our configuration */
     dev(tim)->EGR = TIM_EGR_UG;