diff --git a/library/ecp.c b/library/ecp.c
index 086acb3..4e28b73 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -3277,6 +3277,7 @@
                                     ECP_CURVE448_KEY_SIZE * 8 - 1, 1)
                 );
         }
+        MBEDTLS_MPI_CHK(mbedtls_ecp_check_privkey(&key->grp, &key->d));
     }
 
 #endif