diff --git a/library/sha256.c b/library/sha256.c
index bdc396a..ac15ef8 100644
--- a/library/sha256.c
+++ b/library/sha256.c
@@ -357,6 +357,13 @@
     return( processed );
 }
 
+#if defined(MBEDTLS_SHA256_USE_A64_CRYPTO_IF_PRESENT)
+/*
+ * This function is for internal use only if we are building both C and A64
+ * versions, otherwise it is renamed to be the public mbedtls_internal_sha256_process()
+ */
+static
+#endif
 int mbedtls_internal_sha256_process_a64_crypto( mbedtls_sha256_context *ctx,
         const unsigned char data[SHA256_BLOCK_SIZE] )
 {
@@ -402,6 +409,13 @@
         (d) += local.temp1; (h) = local.temp1 + local.temp2;        \
     } while( 0 )
 
+#if defined(MBEDTLS_SHA256_USE_A64_CRYPTO_IF_PRESENT)
+/*
+ * This function is for internal use only if we are building both C and A64
+ * versions, otherwise it is renamed to be the public mbedtls_internal_sha256_process()
+ */
+static
+#endif
 int mbedtls_internal_sha256_process_c( mbedtls_sha256_context *ctx,
                                 const unsigned char data[SHA256_BLOCK_SIZE] )
 {