diff --git a/src/encrypt.c b/src/encrypt.c
index 7b6b10a0..a5c7dde5 100644
--- a/src/encrypt.c
+++ b/src/encrypt.c
@@ -108,6 +108,7 @@ static const CCAlgorithm supported_ciphers_applecc[CIPHER_NUM] =
     kCCAlgorithmInvalid
 };
 
+#ifdef USE_CRYPTO_POLARSSL
 static const int supported_ciphers_iv_size[CIPHER_NUM] = {
     0, 0, 16, 16, 16, 8, 16, 16, 16, 8, 8, 8, 8, 16
 };
@@ -116,6 +117,7 @@ static const int supported_ciphers_key_size[CIPHER_NUM] = {
     0, 16, 16, 24, 32, 16, 16, 24, 32, 16, 8, 16, 16, 16
 };
 #endif
+#endif
 
 static int random_compare(const void *_x, const void *_y, uint32_t i, uint64_t a)
 {