diff --git a/boards/arm/stm32/stm32f103-minimum/src/stm32_tone.c b/boards/arm/stm32/stm32f103-minimum/src/stm32_tone.c
index c9d7ae2edea..a06886d53f0 100644
--- a/boards/arm/stm32/stm32f103-minimum/src/stm32_tone.c
+++ b/boards/arm/stm32/stm32f103-minimum/src/stm32_tone.c
@@ -55,7 +55,8 @@
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
-/* Configuration ********************************************************************/
+
+/* Configuration ************************************************************/
 
 #define HAVE_TONE 1