--- a/src/openvpn/crypto_openssl.c
+++ b/src/openvpn/crypto_openssl.c
@@ -49,7 +49,7 @@
 #include <openssl/rand.h>
 #include <openssl/ssl.h>
 
-#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
+#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(ENABLE_CRYPTO_WOLFSSL) && !defined(LIBRESSL_VERSION_NUMBER)
 #include <openssl/kdf.h>
 #endif
 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
@@ -1398,7 +1398,7 @@ memcmp_constant_time(const void *a, cons
     return CRYPTO_memcmp(a, b, size);
 }
 
-#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
+#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(ENABLE_CRYPTO_WOLFSSL) && !defined(LIBRESSL_VERSION_NUMBER)
 bool
 ssl_tls1_PRF(const uint8_t *seed, int seed_len, const uint8_t *secret,
              int secret_len, uint8_t *output, int output_len)