diff --git a/library/rsa.c b/library/rsa.c
index dc1fae5..2976b71 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -464,6 +464,7 @@
  * Default RSA interface implementation
  */
 
+#if !defined(MBEDTLS_RSA_ALT)
 
 int mbedtls_rsa_import( mbedtls_rsa_context *ctx,
                         const mbedtls_mpi *N,
@@ -2493,6 +2494,8 @@
 #endif
 }
 
+#endif /* !MBEDTLS_RSA_ALT */
+
 #if defined(MBEDTLS_SELF_TEST)
 
 #include "mbedtls/sha1.h"