diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 9a51f00..2eeb215 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -519,7 +519,7 @@
                 return( PSA_ERROR_INVALID_ARGUMENT );
             break;
 #endif
-#if defined(MBEDTLS_CHACHA20_C)
+#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CHACHA20)
         case PSA_KEY_TYPE_CHACHA20:
             if( bits != 256 )
                 return( PSA_ERROR_INVALID_ARGUMENT );
@@ -3924,7 +3924,7 @@
     {
         operation->iv_size = PSA_BLOCK_CIPHER_BLOCK_LENGTH( slot->attr.type );
     }
-#if defined(MBEDTLS_CHACHA20_C)
+#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CHACHA20)
     else
     if( alg == PSA_ALG_STREAM_CIPHER && slot->attr.type == PSA_KEY_TYPE_CHACHA20 )
         operation->iv_size = 12;