diff --git a/drivers/at25xxx/at25xxx.c b/drivers/at25xxx/at25xxx.c
index 33509b9cf0..b2b3d59e53 100644
--- a/drivers/at25xxx/at25xxx.c
+++ b/drivers/at25xxx/at25xxx.c
@@ -113,7 +113,7 @@ static ssize_t _write_page(const at25xxx_t *dev, uint32_t pos, const void *data,
 
 int at25xxx_write(const at25xxx_t *dev, uint32_t pos, const void *data, size_t len)
 {
-    int res = 0;
+    int res = len;
     const uint8_t *d = data;
 
     if (pos + len > dev->params.size) {
@@ -164,7 +164,7 @@ int at25xxx_read(const at25xxx_t *dev, uint32_t pos, void *data, size_t len)
 
     spi_release(dev->params.spi);
 
-    return 0;
+    return len;
 }
 
 uint8_t at25xxx_read_byte(const at25xxx_t *dev, uint32_t pos)
diff --git a/drivers/include/at25xxx.h b/drivers/include/at25xxx.h
index e4bd598234..33502bd5af 100644
--- a/drivers/include/at25xxx.h
+++ b/drivers/include/at25xxx.h
@@ -82,7 +82,7 @@ uint8_t at25xxx_read_byte(const at25xxx_t *dev, uint32_t pos);
  * @param[out] data     read buffer
  * @param[in] len       requested length to be read
  *
- * @return    0 on success
+ * @return    Number of bytes read
  * @return    -ERANGE if pos + len > EEPROM size
  */
 int at25xxx_read(const at25xxx_t *dev, uint32_t pos, void *data, size_t len);
@@ -104,7 +104,7 @@ void at25xxx_write_byte(const at25xxx_t *dev, uint32_t pos, uint8_t data);
  * @param[in] data      write buffer
  * @param[in] len       requested length to be written
  *
- * @return    0 on success
+ * @return    Number of bytes written
  * @return    -ERANGE if pos + len > EEPROM size
  */
 int at25xxx_write(const at25xxx_t *dev, uint32_t pos, const void *data, size_t len);