diff --git a/client/emv/emv_roca.c b/client/emv/emv_roca.c
index ad39d1043..9297ce452 100644
--- a/client/emv/emv_roca.c
+++ b/client/emv/emv_roca.c
@@ -109,11 +109,15 @@ printf("--roca:%d\n", i);
 		MBEDTLS_MPI_CHK( mbedtls_mpi_read_string(&g_one, 10, "1") );
 
 		MBEDTLS_MPI_CHK( mbedtls_mpi_add_int(&t_prime, &t_prime, g_primes[i]) );
+		print_mpi("--t_prime:", 10, &t_prime);
 		
 		MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi(&t_temp, &t_modulus, &t_prime) ); 
+		print_mpi("--t_temp:", 10, &t_temp);
 		
 		MBEDTLS_MPI_CHK( mbedtls_mpi_shift_l(&g_one, mpi_get_uint(&t_temp)) );
+		print_mpi("--g_one:", 10, &g_one);
 		
+		print_mpi("--g_prints:", 10, &g_prints[i]);
 		if (bitand_is_zero(&t_temp, &g_prints[i])) {
 			PrintAndLogEx(FAILED, "No fingerprint found\n");
 			ret = false;