diff --git a/dbms/src/Interpreters/Cluster.cpp b/dbms/src/Interpreters/Cluster.cpp
index 6fdfaf90ceb..bf30b1ca98f 100644
--- a/dbms/src/Interpreters/Cluster.cpp
+++ b/dbms/src/Interpreters/Cluster.cpp
@@ -374,7 +374,7 @@ void Cluster::assignName()
 	SHA512_Init(&ctx);
 
 	for (const auto & host : elements)
-		SHA512_Update(&ctx, reinterpret_cast<const void *>(host.data()), host.size());
+		SHA512_Update(&ctx, reinterpret_cast<const void *>(host.c_str()), host.size() + 1);
 
 	SHA512_Final(hash, &ctx);