diff --git a/configs/stm32f103-minimum/src/stm32_gpio.c b/configs/stm32f103-minimum/src/stm32_gpio.c
index 03c0e1da0bd..6335acc4a30 100644
--- a/configs/stm32f103-minimum/src/stm32_gpio.c
+++ b/configs/stm32f103-minimum/src/stm32_gpio.c
@@ -181,14 +181,14 @@ static int gpout_write(FAR struct gpio_dev_s *dev, bool value)
   gpioinfo("Writing %d\n", (int)value);
 
   stm32_gpiowrite(g_gpiooutputs[stm32gpio->id], value);
-  return OK;    
+  return OK;
 }
 
 static int gpint_attach(FAR struct gpio_dev_s *dev,
                         pin_interrupt_t callback)
 {
   FAR struct stm32gpint_dev_s *stm32gpint = (FAR struct stm32gpint_dev_s *)dev;
- 
+
   gpioinfo("Attaching the callback\n");
 
   /* Make sure the interrupt is disabled */
diff --git a/configs/stm32f103-minimum/src/stm32_mfrc522.c b/configs/stm32f103-minimum/src/stm32_mfrc522.c
index d55842eca7f..441bc5a6fa2 100644
--- a/configs/stm32f103-minimum/src/stm32_mfrc522.c
+++ b/configs/stm32f103-minimum/src/stm32_mfrc522.c
@@ -88,7 +88,7 @@ int stm32_mfrc522initialize(FAR const char *devpath)
     }
 
   /* Then register the MFRC522 */
-  
+
   ret = mfrc522_register(devpath, spi);
   if (ret < 0)
     {
diff --git a/configs/stm32f103-minimum/src/stm32_tone.c b/configs/stm32f103-minimum/src/stm32_tone.c
index 4afeb09f826..80449d56c6b 100644
--- a/configs/stm32f103-minimum/src/stm32_tone.c
+++ b/configs/stm32f103-minimum/src/stm32_tone.c
@@ -2,7 +2,7 @@
  * configs/stm32f103minimum/src/stm32_tone.c
  *
  *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
- *   Author: Alan Carvalho de Assis <acassis@gmail.com> 
+ *   Author: Alan Carvalho de Assis <acassis@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions