diff --git a/library/bignum_mod.c b/library/bignum_mod.c
index 3eef4e7..4ac6277 100644
--- a/library/bignum_mod.c
+++ b/library/bignum_mod.c
@@ -248,8 +248,7 @@
 
     r->limbs = m->limbs;
 
-    if( m->int_rep == MBEDTLS_MPI_MOD_REP_MONTGOMERY )
-       ret = mbedtls_mpi_mod_raw_to_mont_rep( r->p, m );
+    ret = mbedtls_mpi_mod_raw_canonical_to_modulus_rep( r->p, m );
 
 cleanup:
     return ( ret );