diff --git a/rsa.h b/rsa.h
index 420a7bb3..debaa447 100644
--- a/rsa.h
+++ b/rsa.h
@@ -161,11 +161,13 @@ typedef RSAES<OAEP<SHA> >::Encryptor RSAES_OAEP_SHA_Encryptor;
 typedef RSASS<PKCS1v15, SHA>::Signer RSASSA_PKCS1v15_SHA_Signer;
 typedef RSASS<PKCS1v15, SHA>::Verifier RSASSA_PKCS1v15_SHA_Verifier;
 
+namespace Weak {
 typedef RSASS<PKCS1v15, MD2>::Signer RSASSA_PKCS1v15_MD2_Signer;
 typedef RSASS<PKCS1v15, MD2>::Verifier RSASSA_PKCS1v15_MD2_Verifier;
 
 typedef RSASS<PKCS1v15, MD5>::Signer RSASSA_PKCS1v15_MD5_Signer;
 typedef RSASS<PKCS1v15, MD5>::Verifier RSASSA_PKCS1v15_MD5_Verifier;
+}
 
 NAMESPACE_END