diff --git a/include/mbedtls/platform_util.h b/include/mbedtls/platform_util.h
index f2aeffc..67a7877 100644
--- a/include/mbedtls/platform_util.h
+++ b/include/mbedtls/platform_util.h
@@ -178,8 +178,9 @@
  * \param value Value to be used when setting the buffer.
  * \param num   The length of the buffer in bytes.
  *
+ * \return      The value of \p ptr.
  */
-void mbedtls_platform_memset( void *ptr, int value, size_t num );
+void *mbedtls_platform_memset( void *ptr, int value, size_t num );
 
 /**
  * \brief       Secure memcpy
@@ -195,8 +196,9 @@
  * \param src   Source buffer where the data is being copied from.
  * \param num   The length of the buffers in bytes.
  *
+ * \return      The value of \p dst.
  */
-void mbedtls_platform_memcpy( void *dst, const void *src, size_t num );
+void *mbedtls_platform_memcpy( void *dst, const void *src, size_t num );
 
 /**
  * \brief       Secure memcmp