diff --git a/drivers/gpio/mcp23018.h b/drivers/gpio/mcp23018.h
index 3af3b22f2a4a..e7c2730dd155 100644
--- a/drivers/gpio/mcp23018.h
+++ b/drivers/gpio/mcp23018.h
@@ -31,7 +31,7 @@ enum {
 };
 
 /**
- * Init expander and any other dependent drivers 
+ * Init expander and any other dependent drivers
  */
 void mcp23018_init(uint8_t slave_addr);
 
@@ -46,8 +46,8 @@ bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf)
 bool mcp23018_set_output(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf);
 
 /**
- * Write high/low to both ports sequentially 
- * 
+ * Write high/low to both ports sequentially
+ *
  *  - slightly faster than multiple set_output
  */
 bool mcp23018_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB);
@@ -59,7 +59,7 @@ bool mcp23018_readPins(uint8_t slave_addr, mcp23018_port_t port, uint8_t* ret);
 
 /**
  * Read state of both ports sequentially
- * 
+ *
  *  - slightly faster than multiple readPins
  */
 bool mcp23018_readPins_all(uint8_t slave_addr, uint16_t* ret);
diff --git a/drivers/gpio/pca9555.h b/drivers/gpio/pca9555.h
index 21a4bab8be28..6362ab68aeba 100644
--- a/drivers/gpio/pca9555.h
+++ b/drivers/gpio/pca9555.h
@@ -69,8 +69,8 @@ bool pca9555_set_config(uint8_t slave_addr, pca9555_port_t port, uint8_t conf);
 bool pca9555_set_output(uint8_t slave_addr, pca9555_port_t port, uint8_t conf);
 
 /**
- * Write high/low to both ports sequentially 
- * 
+ * Write high/low to both ports sequentially
+ *
  *  - slightly faster than multiple set_output
  */
 bool pca9555_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB);
@@ -82,7 +82,7 @@ bool pca9555_readPins(uint8_t slave_addr, pca9555_port_t port, uint8_t* ret);
 
 /**
  * Read state of both ports sequentially
- * 
+ *
  *  - slightly faster than multiple readPins
  */
 bool pca9555_readPins_all(uint8_t slave_addr, uint16_t* ret);