diff --git a/library/aesce.c b/library/aesce.c
index 600326a..ecfadcd 100644
--- a/library/aesce.c
+++ b/library/aesce.c
@@ -109,7 +109,7 @@
 /* Two rounds of AESCE encryption */
 #define AESCE_ENCRYPT_ROUND_X2        AESCE_ENCRYPT_ROUND; AESCE_ENCRYPT_ROUND
 
-MBEDTLS_OPTIMIZE_ALWAYS
+MBEDTLS_OPTIMIZE_FOR_PERFORMANCE
 static uint8x16_t aesce_encrypt_block(uint8x16_t block,
                                       unsigned char *keys,
                                       int rounds)
@@ -173,7 +173,7 @@
 /* Two rounds of AESCE decryption */
 #define AESCE_DECRYPT_ROUND_X2        AESCE_DECRYPT_ROUND; AESCE_DECRYPT_ROUND
 
-MBEDTLS_OPTIMIZE_ALWAYS
+MBEDTLS_OPTIMIZE_FOR_PERFORMANCE
 static uint8x16_t aesce_decrypt_block(uint8x16_t block,
                                       unsigned char *keys,
                                       int rounds)
@@ -210,7 +210,7 @@
 /*
  * AES-ECB block en(de)cryption
  */
-MBEDTLS_OPTIMIZE_ALWAYS
+MBEDTLS_OPTIMIZE_FOR_PERFORMANCE
 int mbedtls_aesce_crypt_ecb(mbedtls_aes_context *ctx,
                             int mode,
                             const unsigned char input[16],