diff --git a/library/blowfish.c b/library/blowfish.c
index 719aea6..910d610 100644
--- a/library/blowfish.c
+++ b/library/blowfish.c
@@ -233,6 +233,7 @@
     return( 0 );
 }
 
+#if defined(POLARSSL_CIPHER_MODE_CBC)
 /*
  * Blowfish-CBC buffer encryption/decryption
  */
@@ -284,6 +285,7 @@
 
     return( 0 );
 }
+#endif /* POLARSSL_CIPHER_MODE_CBC */
 
 #if defined(POLARSSL_CIPHER_MODE_CFB)
 /*