diff --git a/library/constant_time.c b/library/constant_time.c
index 3cdbac2..79c98c7 100644
--- a/library/constant_time.c
+++ b/library/constant_time.c
@@ -81,7 +81,7 @@
 #endif
 }
 
-#if defined(MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC)
+#if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
 
 size_t mbedtls_ct_size_mask( size_t value )
 {
@@ -97,7 +97,7 @@
 #endif
 }
 
-#endif /* MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC */
+#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
 
 #if defined(MBEDTLS_BIGNUM_C)
 
@@ -404,7 +404,7 @@
 
 #endif /* MBEDTLS_PKCS1_V15 && MBEDTLS_RSA_C && ! MBEDTLS_RSA_ALT */
 
-#if defined(MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC)
+#if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
 
 void mbedtls_ct_memcpy_if_eq( unsigned char *dest,
                               const unsigned char *src,
@@ -527,7 +527,7 @@
     return( ret );
 }
 
-#endif /* MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC */
+#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
 
 #if defined(MBEDTLS_BIGNUM_C)