diff --git a/lib/base/tlsutility.cpp b/lib/base/tlsutility.cpp
index e69197529..5090d4d54 100644
--- a/lib/base/tlsutility.cpp
+++ b/lib/base/tlsutility.cpp
@@ -332,7 +332,7 @@ int MakeX509CSR(const String& cn, const String& keyfile, const String& csrfile,
 		X509_NAME *name = X509_REQ_get_subject_name(req);
 		X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, (unsigned char *)cn.CStr(), -1, -1, 0);
 	
-		X509_REQ_sign(req, key, NULL);
+		X509_REQ_sign(req, key, EVP_sha256());
 	
 		Log(LogInformation, "base")
 		    << "Writing certificate signing request to '" << csrfile << "'.";