diff --git a/library/cipher_wrap.h b/library/cipher_wrap.h
index c85a4ef..2cbc216 100644
--- a/library/cipher_wrap.h
+++ b/library/cipher_wrap.h
@@ -93,9 +93,11 @@
     int (*setkey_enc_func)(void *ctx, const unsigned char *key,
                            unsigned int key_bitlen);
 
+#if !defined(MBEDTLS_CIPHER_ENCRYPT_ONLY)
     /** Set key for decryption purposes */
     int (*setkey_dec_func)(void *ctx, const unsigned char *key,
                            unsigned int key_bitlen);
+#endif
 
     /** Allocate a new context */
     void * (*ctx_alloc_func)(void);