diff --git a/include/mbedtls/sha512.h b/include/mbedtls/sha512.h
index 56cefe1..5e6a855 100644
--- a/include/mbedtls/sha512.h
+++ b/include/mbedtls/sha512.h
@@ -55,7 +55,7 @@
     uint64_t total[2];          /*!< The number of Bytes processed. */
     uint64_t state[8];          /*!< The intermediate digest state. */
     unsigned char buffer[128];  /*!< The data block being processed. */
-#if !defined(MBEDTLS_SHA512_NO_SHA384)
+#if defined(MBEDTLS_SHA384_C)
     int is384;                  /*!< Determines which function to use:
                                      0: Use SHA-512, or 1: Use SHA-384. */
 #endif
@@ -101,8 +101,8 @@
  * \param is384    Determines which function to use. This must be
  *                 either \c 0 for SHA-512, or \c 1 for SHA-384.
  *
- * \note           When \c MBEDTLS_SHA512_NO_SHA384 is defined, \p is384 must
- *                 be \c 0, or the function will return
+ * \note           When \c MBEDTLS_SHA384_C is not defined,
+ *                 \p is384 must be \c 0, or the function will return
  *                 #MBEDTLS_ERR_SHA512_BAD_INPUT_DATA.
  *
  * \return         \c 0 on success.
@@ -175,8 +175,8 @@
  * \param is384    Determines which function to use. This must be either
  *                 \c 0 for SHA-512, or \c 1 for SHA-384.
  *
- * \note           When \c MBEDTLS_SHA512_NO_SHA384 is defined, \p is384 must
- *                 be \c 0, or the function will return
+ * \note           When \c MBEDTLS_SHA384_C is defined, \p is384 must
+ *                 be \c 1, or the function will return
  *                 #MBEDTLS_ERR_SHA512_BAD_INPUT_DATA.
  *
  * \return         \c 0 on success.